path: root/gnome2-accessibility-guide/C/dtconfig.xml

<?xml version="1.0" encoding="utf-8"?>
<chapter id="dtconfig-0">
  <title>Configuring the Mouse and Keyboard</title>
  <para>This chapter describes how to configure the mouse and keyboard to make
these devices accessible to more users.</para>
  <sect1 id="dtconfig-1">
    <title>Configuring the Mouse</title>
    <para>Use the <guilabel>Mouse</guilabel> preference tool to configure the
mouse to suit your needs. To open the <guilabel>Mouse</guilabel> preference
tool, choose <menuchoice><guimenu>Applications</guimenu><guisubmenu>Desktop Preferences</guisubmenu><guimenuitem>Mouse</guimenuitem></menuchoice>.
The <guilabel>Mouse Preferences</guilabel> dialog is displayed.</para>
    <sect2 id="dtconfig-2">
      <title>To Configure the Behavior of the Mouse</title>
      <para>The following sections describe how to modify the behavior of the mouse
to suit your needs. </para>
      <sect3 id="dtconfig-3">
        <title>To Configure the Mouse for Left-Handed Use</title>
        <para>To configure the mouse for left-handed use, click on the <guilabel>Buttons</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog,
then select the <guilabel>Left-handed mouse</guilabel> option. When you select
this option, the system swaps the functions of the left mouse button and the
right mouse button immediately.</para>
      </sect3>
      <sect3 id="dtconfig-4">
        <title>To Configure the Double-Click Behavior</title>
        <para>If you have difficulty double-clicking, you can increase the period
of time that the system allows to elapse between the first click and the second
click of a double-click. For example, if the double-click timeout setting
is 0.4 seconds, you must perform the second click of a double-click within
0.4 seconds of the first click. If the second click occurs more than 0.4 seconds
after the first click, the system interprets the two clicks as two single
clicks. </para>
        <para>To configure the double-click timeout setting, perform the following
steps:</para>
        <orderedlist>
          <listitem>
            <para>Click on the <guilabel>Buttons</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog.</para>
          </listitem>
          <listitem>
            <para>Use the <guilabel>Delay</guilabel> slider to specify the timeout
in seconds that the system allows between the two clicks of a double-click. </para>
          </listitem>
          <listitem>
            <para>Double-click on the light bulb to the right of the slider
to test the setting. If you perform the two clicks of the double-click within
the timeout specified, the light bulb lights up fully to display a yellow
glow around the bulb. If you do not double-click within the timeout specified,
the light bulb does not light fully. You should increase the timeout setting
and try again. When the light bulb lights, the timeout setting is suitable
for your needs. </para>
          </listitem>
        </orderedlist>
      </sect3>
      <sect3 id="dtconfig-5">
        <title>To Configure the Speed and Sensitivity of the Mouse</title>
        <para>To configure the speed and sensitivity of the mouse, perform the following
steps: </para>
        <orderedlist>
          <listitem>
            <para>Click on the <guilabel>Motion</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog. </para>
          </listitem>
          <listitem>
            <para>Configure the following options:</para>
            <variablelist>
              <varlistentry>
                <term>Acceleration</term>
                <listitem>
                  <para>Use the slider to specify
the speed at which the mouse pointer moves around the screen when you move
your mouse. </para>
                  <para>If you select a low setting, the mouse pointer moves at a speed similar
to the speed at which you are physically moving the mouse. This means that
you need to physically move the mouse larger distances to cover the screen
area. If you select a high setting, the mouse pointer moves at a faster speed
than the speed at which you are physically moving the mouse. This means that
you need to physically move the mouse small distances to cover the screen
area.</para>
                </listitem>
              </varlistentry>
              <varlistentry>
                <term>Sensitivity</term>
                <listitem>
                  <para>Use the slider to specify
how sensitive the mouse pointer is to movements of your mouse.</para>
                </listitem>
              </varlistentry>
              <varlistentry>
                <term>Threshold</term>
                <listitem>
                  <para>Use the slider to specify
the distance that you must move an item before the system interprets the move
action as a drag-and-drop action.</para>
                </listitem>
              </varlistentry>
            </variablelist>
          </listitem>
        </orderedlist>
      </sect3>
      <sect3 id="dtconfig-6">
        <title>To Locate the Mouse Pointer</title>
        <para>If you have difficulty locating the mouse pointer on the screen, you
can enable an option to highlight the pointer when you press the <keycap>Control</keycap> key. To enable this option, click on the <guilabel>Cursors</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog, then
select the <guilabel>Show position of cursor when the Control key is pressed</guilabel> option. When you press <keycap>Control</keycap>, the system displays
an animation around the pointer to highlight the pointer. </para>
        <note>
          <para>On some platforms, you must log out and log in again before this
setting takes effect.</para>
        </note>
      </sect3>
    </sect2>
    <sect2 id="dtconfig-7">
      <title>To Configure the Mouse Pointer</title>
      <para>The following sections describe how to modify the display characteristics
of the pointer. </para>
      <sect3 id="dtconfig-8">
        <title>To Change the Pointer</title>
        <para>To select the type of pointer that is displayed on the Desktop, perform
the following steps:</para>
        <orderedlist>
          <listitem>
            <para>Click on the <guilabel>Cursors</guilabel> tab in the <guilabel>Mouse Preferences</guilabel> dialog. </para>
          </listitem>
          <listitem>
            <para>Select one of the following themes from the pointer themes
that are listed in the <guilabel>Cursor Theme</guilabel> list box:</para>
            <itemizedlist>
              <listitem>
                <para>Default Cursor</para>
                <para>Displays the default black pointer.</para>
              </listitem>
              <listitem>
                <para>White Cursor</para>
                <para>Displays a white pointer that is the same size as the default pointer.</para>
              </listitem>
              <listitem>
                <para>Large Cursor</para>
                <para>Displays a large black pointer.</para>
              </listitem>
              <listitem>
                <para>Large White Cursor</para>
                <para>Displays a large white pointer.</para>
              </listitem>
            </itemizedlist>
          </listitem>
          <listitem>
            <para>To change the pointer theme, you must log out of your session
and log in again.</para>
          </listitem>
        </orderedlist>
      </sect3>
      <sect3 id="dtconfig-9">
        <title>To Stop the Cursor Blinking</title>
        <para>To stop the cursor blinking in text boxes and fields, perform the following
steps: </para>
        <orderedlist>
          <listitem>
            <para>Choose <menuchoice><guimenu>Applications</guimenu><guisubmenu>Desktop Preferences</guisubmenu><guimenuitem>Keyboard</guimenuitem></menuchoice> to start the <application>Keyboard</application>
preference tool.</para>
          </listitem>
          <listitem>
            <para>In the <guilabel>Keyboard</guilabel> tabbed section, deselect
the <guilabel>Blinks in text boxes and fields</guilabel> option.</para>
          </listitem>
        </orderedlist>
      </sect3>
    </sect2>
    <sect2 id="dtconfig-10">
      <title>To Use the Keyboard to Emulate the Mouse</title>
      <para>If you have difficulty using a mouse, you can use the keyboard to emulate
the mouse functions. See <xref linkend="dtconfig-14"/> of this manual for more
information.</para>
    </sect2>
  </sect1>
  <sect1 id="dtconfig-11">
    <title>Configuring the Keyboard</title>
    <para>Use the <application>Keyboard Accessibility</application> preference
tool, also known as <application>AccessX</application>, to configure the keyboard
accessibility options. To start <application>AccessX</application>, choose
.<menuchoice><guimenu>Applications</guimenu><guisubmenu>Desktop Preferences</guisubmenu><guisubmenu>Accessibility</guisubmenu><guimenuitem>Keyboard</guimenuitem></menuchoice>.</para>
    <para>The <application>AccessX</application> dialog enables you to customize
your keyboard in the following ways:</para>
    <itemizedlist>
      <listitem>
        <para>To use the numeric keypad to emulate mouse actions. See <xref linkend="dtconfig-14"/>.</para>
      </listitem>
      <listitem>
        <para>To specify the duration for which you must press-and-hold
a key before the system accepts the keypress. See <xref linkend="dtconfig-15"/>.</para>
      </listitem>
      <listitem>
        <para>To ignore rapid, repeated keypresses of the same key. See <xref linkend="dtconfig-16"/>.</para>
      </listitem>
      <listitem>
        <para>To accept key combinations in sequence rather than simultaneously.
See <xref linkend="dtconfig-17"/>.</para>
      </listitem>
      <listitem>
        <para>To emit an audible notification when a user activates or deactivates
a toggle key. See <xref linkend="dtconfig-18"/>.</para>
      </listitem>
      <listitem>
        <para>To ignore long keypresses of the same key and control the
repeat rate of a keypress. See <xref linkend="dtconfig-19"/>.</para>
      </listitem>
    </itemizedlist>
    <sect2 id="dtconfig-12">
      <title>Before You Can Use AccessX in the Solaris&#8482; Operating Environment</title>
      <para>If you are using the GNOME Desktop for the Solaris&#8482; 8 operating
environment or the Solaris 9 operating environment, you must enable XKB on
your system before you can use the <application>AccessX</application> preference
tool. </para>
      <note>
        <para>XKB is not currently supported on Sun Ray&#8482; systems.</para>
      </note>
      <para>To enable XKB on a non-Sun Ray Solaris system, perform the following
steps:</para>
      <orderedlist>
        <listitem>
          <para>Log in as root.</para>
        </listitem>
        <listitem>
          <para>Check if the path and file <filename>/etc/dt/config/Xservers</filename> exists on your system.</para>
        </listitem>
        <listitem>
          <para>If the <filename>/etc/dt/config</filename> directory does
not exist, enter the following command:</para>
          <screen>
            <command>mkdir -p /etc/dt/config</command>
          </screen>
        </listitem>
        <listitem>
          <para>If the <filename>Xservers</filename> file is not present,
enter the following command:</para>
          <screen>
            <command>cp /usr/dt/config/Xservers /etc/dt/config/Xservers</command>
          </screen>
        </listitem>
        <listitem>
          <para>Open the <filename>Xservers</filename> file in a text editor
and scroll to the end of the file. </para>
        </listitem>
        <listitem>
          <para>Append the following to the command line at the end of the
file:</para>
          <screen>
            <userinput>+kb</userinput>
          </screen>
        </listitem>
        <listitem>
          <para>Save and close the file.</para>
        </listitem>
        <listitem>
          <para>Enter the following command at a command line:</para>
          <screen>
            <command>pkill -HUP dtlogin</command>
          </screen>
        </listitem>
        <listitem>
          <para>Log out of your GNOME session and log in again.</para>
        </listitem>
        <listitem>
          <para>To verify if XKB is running, enter <command>xdpyinfo</command>
and search for XKEYBOARD in the extensions list.</para>
        </listitem>
      </orderedlist>
    </sect2>
    <sect2 id="dtconfig-13">
      <title>To Activate the Keyboard Accessibility Options</title>
      <para>To activate the keyboard accessibility options, perform the following
steps: </para>
      <orderedlist>
        <listitem>
          <para>Select the <guilabel>Enable keyboard accessibility features</guilabel> option.</para>
        </listitem>
        <listitem>
          <para>Click on the <guilabel>Basic</guilabel> tab to display the <guilabel>Basic</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Beep when features turned on or off from
the keyboard</guilabel> option to receive an audible notification each time
a user enables or disables a keyboard accessibility option using the following
keyboard shortcuts:</para>
          <itemizedlist>
            <listitem>
              <para>Press-and-hold <keycap>Shift</keycap> for eight seconds to
enable or disable the slow keys feature. </para>
            </listitem>
            <listitem>
              <para>Press <keycap>Shift</keycap> five times to enable or disable
the sticky keys feature.</para>
            </listitem>
          </itemizedlist>
        </listitem>
        <listitem>
          <para>To automatically disable the keyboard accessibility options
if the options are not used for a specified number of seconds, select the <guilabel>Disable if unused for X seconds</guilabel> option. Use the slider to specify
the number of seconds of keyboard idle time required before the system disables
the keyboard accessibility options. </para>
          <para>This option is intended for computers that are shared by a number of
different users, some of whom require the keyboard accessibility options. </para>
        </listitem>
        <listitem>
          <para>If you are a GNOME for Linux user, you must log out and log
in again before the accessibility settings take effect. </para>
        </listitem>
      </orderedlist>
    </sect2>
    <sect2 id="dtconfig-14">
      <title>To Enable the Keyboard to Emulate the Mouse</title>
      <para>The mouse keys feature enables you to use the numeric keypad on the
keyboard to emulate mouse actions. This feature benefits users who have difficulty
using a mouse or other pointing device. To enable and configure the mouse
keys feature, perform the following steps:</para>
      <orderedlist>
        <listitem>
          <para>Click on the <guilabel>Mouse</guilabel> tab to display the <guilabel>Mouse</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Enable Mouse Keys</guilabel> option.</para>
        </listitem>
        <listitem>
          <para>Configure the following options to determine the behavior
of the mouse pointer when you control the pointer from the numeric keypad:</para>
          <variablelist>
            <varlistentry>
              <term>
                <guilabel>Maximum pointer speed</guilabel>
              </term>
              <listitem>
                <para>Use this spin box to specify the maximum speed, in pixels per second,
at which the pointer moves around the screen.</para>
              </listitem>
            </varlistentry>
            <varlistentry>
              <term>
                <guilabel>Time to accelerate to maximum speed</guilabel>
              </term>
              <listitem>
                <para>Use this spin box to specify the duration, in milliseconds,
before the pointer accelerates to the maximum pointer speed. </para>
              </listitem>
            </varlistentry>
            <varlistentry>
              <term>
                <guilabel>Delay between keypress and pointer movement</guilabel>
              </term>
              <listitem>
                <para>Use this spin box to specify the interval,
in milliseconds, between a keypress and the time when the pointer starts to
move. </para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </orderedlist>
      <para>When you enable mouse keys, the keys on the numeric keypad have the
following functions:</para>
      <table frame="topbot" id="dtconfig-TBL-1">
        <title>Numeric Keypad to Mouse Functions Mapping on Solaris Systems</title>
        <tgroup cols="2" colsep="0" rowsep="0">
          <colspec colname="colspec0" colwidth="52.78*"/>
          <colspec colname="colspec1" colwidth="47.22*"/>
          <thead>
            <row rowsep="1">
              <entry>
                <para>Numeric Keypad Keys</para>
              </entry>
              <entry>
                <para>Function</para>
              </entry>
            </row>
          </thead>
          <tbody>
            <row>
              <entry valign="top">
                <para>1, 2, 3, 4, 6, 7, 8, 9</para>
              </entry>
              <entry valign="top">
                <para>Move the mouse pointer around the screen</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>5</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button click</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>0</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button double-click</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>.</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button press</para>
              </entry>
            </row>
            <row>
              <entry valign="top">
                <para>/</para>
              </entry>
              <entry valign="top">
                <para>Mouse button 1</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>*</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button 2</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>-</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button 3</para>
              </entry>
            </row>
          </tbody>
        </tgroup>
      </table>
      <table frame="topbot" id="dtconfig-TBL-4">
        <title>Numeric Keypad to Mouse Functions Mapping on Linux Systems</title>
        <tgroup cols="2" colsep="0" rowsep="0">
          <colspec colname="colspec0" colwidth="52.78*"/>
          <colspec colname="colspec1" colwidth="47.22*"/>
          <thead>
            <row rowsep="1">
              <entry>
                <para>Numeric Keypad Keys</para>
              </entry>
              <entry>
                <para>Function</para>
              </entry>
            </row>
          </thead>
          <tbody>
            <row>
              <entry valign="top">
                <para>1, 2, 3, 4, 6, 7, 8, 9</para>
              </entry>
              <entry valign="top">
                <para>Move the mouse pointer around the screen</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>5</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button click</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>+</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button double-click</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>0</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button 3</para>
              </entry>
            </row>
          </tbody>
        </tgroup>
      </table>
      <para>Some Solaris systems also use the function keys to emulate the mouse
buttons. The common function key to mouse button mappings are described in
the following table.</para>
      <table frame="topbot" id="dtconfig-TBL-2">
        <title>Function Keys to Mouse Functions Mapping on Solaris Systems</title>
        <tgroup cols="2" colsep="0" rowsep="0">
          <colspec colname="colspec0" colwidth="52.78*"/>
          <colspec colname="colspec1" colwidth="47.22*"/>
          <thead>
            <row rowsep="1">
              <entry>
                <para>Function Key</para>
              </entry>
              <entry>
                <para>Function</para>
              </entry>
            </row>
          </thead>
          <tbody>
            <row>
              <entry valign="top">
                <para>F2</para>
              </entry>
              <entry valign="top">
                <para>Mouse button 1</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>F3</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button 2</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>F4</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Mouse button 3</para>
              </entry>
            </row>
          </tbody>
        </tgroup>
      </table>
    </sect2>
    <sect2 id="dtconfig-15">
      <title>To Enable the Slow Keys Feature</title>
      <para>The slow keys feature enables you to customize how the keyboard handles
user input in the following ways:</para>
      <itemizedlist>
        <listitem>
          <para>Specify the duration for which you must press-and-hold a key
before the system accepts the keypress. This aspect of the feature benefits
users who frequently press keys that they do not intend to press. </para>
        </listitem>
        <listitem>
          <para>Enable audible indications of keyboard input and acceptance.
This aspect of the feature benefits users who cannot see the result of a keypress.</para>
        </listitem>
      </itemizedlist>
      <para>To enable and configure the slow keys feature, perform the following
steps:</para>
      <orderedlist>
        <listitem>
          <para>Click on the <guilabel>Filters</guilabel> tab to display the <guilabel>Filters</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Enable Slow Keys</guilabel> option. </para>
          <tip>
            <para>To select or deselect this feature from the keyboard, press-and-hold <keycap>Shift</keycap> for eight seconds. This keyboard shortcut automatically selects
all of the slow keys options. If you selected the <guilabel>Beep when enabling/disabling
keyboard accessibility features</guilabel> option, after four seconds the
system beeps three times to indicate that the system is about to select or
deselect the feature. If you enable this feature from the keyboard, you must
press-and-hold <keycap>Shift</keycap> for eight seconds again to disable the
feature.</para>
          </tip>
        </listitem>
        <listitem>
          <para>Use the <guilabel>Only accept keys held for</guilabel> slider
or spin box to specify the duration, in milliseconds, for which you must press-and-hold
a key before the system accepts the keypress. Use the <guilabel>Type to test
settings</guilabel> text box to test the slow keys setting and modify the
setting as required. </para>
        </listitem>
        <listitem>
          <para>To enable audible indications of keyboard input and acceptance,
select the following options:</para>
          <variablelist>
            <varlistentry>
              <term>
                <guilabel>Beep when key is pressed</guilabel>
              </term>
              <listitem>
                <para>Select this option to hear a beep when you press a key.</para>
              </listitem>
            </varlistentry>
            <varlistentry>
              <term>
                <guilabel>Beep when key is accepted</guilabel>
              </term>
              <listitem>
                <para>Select this option to hear a beep when the system accepts
a keypress. </para>
              </listitem>
            </varlistentry>
            <varlistentry>
              <term>
                <guilabel>Beep when key is rejected</guilabel>
              </term>
              <listitem>
                <para>Select this option to hear a beep when the system rejects
a keypress. The system rejects a keypress if you do not press-and-hold the
key for the duration that is specified in the <guilabel>Only accept keypress
after x msecs</guilabel> setting.</para>
              </listitem>
            </varlistentry>
          </variablelist>
        </listitem>
      </orderedlist>
      <para/>
    </sect2>
    <sect2 id="dtconfig-16">
      <title>To Enable the Bounce Keys Feature</title>
      <para>The bounce keys feature enables you to customize the keyboard to ignore
rapid, repeated keypresses of the same key. For example, users with impaired
motor skills might press the same key several times when they intend to press
the key once. This feature enables you to customize the keyboard to ignore
repeated keypresses. </para>
      <para>To enable and configure the bounce keys feature, perform the following
steps:</para>
      <orderedlist>
        <listitem>
          <para>Click on the <guilabel>Filters</guilabel> tab to display the <guilabel>Filters</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Enable Bounce Keys</guilabel> option. </para>
        </listitem>
        <listitem>
          <para>Use the <guilabel>Ignore duplicate keypresses within</guilabel>
slider or spin box to specify the duration after the first keypress for which
the system ignores repeated keypresses of the same key. For example, if you
select a duration of 500 msecs, the system ignores all repeated keypresses
of the same key that occur within 500 msecs of the first keypress.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Beep if key is rejected</guilabel> option
to hear an audible indication when the system ignores a key.</para>
        </listitem>
      </orderedlist>
      <note>
        <para>If you wish to enable the bounce keys feature, please ensure that
the <guilabel>Enable Slow Keys</guilabel> option is deselected. The slow keys
feature requires you to press a key for a specified duration before the system
accepts the keypress as a valid keypress. If you cannot press the key for
the duration that is specified by the slow keys setting, the system does not
accept your input unless you deselect the <guilabel>Enable Slow Keys</guilabel>
option.</para>
      </note>
    </sect2>
    <sect2 id="dtconfig-17">
      <title>To Enable the Sticky Keys Feature</title>
      <para>The sticky keys feature enables you to press the keys in a key combination
in sequence rather than simultaneously. This feature is designed for users
who are unable to press two or more keys simultaneously. </para>
      <para>To enable and configure the sticky keys feature, perform the following
steps:</para>
      <orderedlist>
        <listitem>
          <para>Click on the <guilabel>Basic</guilabel> tab to display the <guilabel>Basic</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Enable Sticky Keys</guilabel> option.</para>
          <tip>
            <para>To enable the sticky keys feature from the keyboard, press <keycap>Shift</keycap> five times. This keyboard shortcut automatically selects all
of the sticky keys options. If you selected the <guilabel>Beep when enabling/disabling
keyboard accessibility features</guilabel> option, the system beeps to indicate
that the system is about to select or deselect the feature. If you enable
this feature from the keyboard, press <keycap>Shift</keycap> five times again
to disable the feature.</para>
          </tip>
        </listitem>
        <listitem>
          <para>Select the <guilabel>Beep when modifier is pressed</guilabel>
option to receive an audible indication each time you press a modifier key.
This option is useful to remind you whether a modifier key is active or inactive. </para>
        </listitem>
        <listitem>
          <para>To automatically disable the sticky keys feature when a user
presses two keys simultaneously, select the <guilabel>Disable if two keys
pressed together</guilabel> option.</para>
        </listitem>
      </orderedlist>
      <para>You can use the sticky keys feature in latch or lock mode. The following
table describes how to choose a mode and the difference between the two modes.</para>
      <table frame="topbot" id="dtconfig-TBL-3">
        <title>Sticky Keys Latch or Lock Mode</title>
        <tgroup cols="3" colsep="0" rowsep="0">
          <colspec colname="colspec0" colwidth="52.78*"/>
          <colspec colname="colspec1" colwidth="47.22*"/>
          <colspec colname="colspec2" colwidth="47.22*"/>
          <thead>
            <row rowsep="1">
              <entry valign="top">
                <para>To use the sticky keys feature in...</para>
              </entry>
              <entry valign="top">
                <para>Press the modifier key...</para>
              </entry>
              <entry colname="colspec2" valign="top">
                <para>The modifier key stays active
until...</para>
              </entry>
            </row>
          </thead>
          <tbody>
            <row>
              <entry valign="top">
                <para>Latch mode</para>
              </entry>
              <entry valign="top">
                <para>Once.</para>
              </entry>
              <entry colname="colspec2" valign="top">
                <para>You press
a non-modifier key.</para>
              </entry>
            </row>
            <row>
              <entry colname="colspec0" valign="top">
                <para>Lock mode</para>
              </entry>
              <entry colname="colspec1" valign="top">
                <para>Twice in quick succession.</para>
              </entry>
              <entry colname="colspec2" valign="top">
                <para>You press the modifier key again.</para>
              </entry>
            </row>
          </tbody>
        </tgroup>
      </table>
      <para>For example, if you want to press <keycombo><keycap>Alt</keycap><keycap>F1</keycap></keycombo>, you should do the following:</para>
      <orderedlist>
        <listitem>
          <para>Press <keycap>Alt</keycap> to latch the modifier key. The <keycap>Alt</keycap> key remains active.</para>
        </listitem>
        <listitem>
          <para>Press <keycap>F1</keycap>. The key combination is now complete.
After you press <keycap>F1</keycap>, the <keycap>Alt</keycap> modifier key
is no longer active.</para>
        </listitem>
      </orderedlist>
      <para>As another example, if you want to press <keycombo><keycap>Ctrl</keycap><keycap>Alt</keycap><keycap>Tab</keycap></keycombo>, you should do the following. </para>
      <orderedlist>
        <listitem>
          <para>Press <keycap>Ctrl</keycap> twice to lock the modifier key.
The <keycap>Ctrl</keycap> remains active.</para>
        </listitem>
        <listitem>
          <para>Press <keycap>Alt</keycap>. </para>
        </listitem>
        <listitem>
          <para>Press <keycap>Tab</keycap>. The key combination is now complete. </para>
        </listitem>
        <listitem>
          <para>To unlock the modifier key, press <keycap>Ctrl</keycap> again.</para>
        </listitem>
      </orderedlist>
    </sect2>
    <sect2 id="dtconfig-18">
      <title>To Enable Audible Notifications for Toggle Keys</title>
      <para>A toggle key is any key on the keyboard that can switch between two
states. The <keycap>Num Lock</keycap>, <keycap>Caps Lock</keycap>, and <keycap>Scroll Lock</keycap> keys are toggle keys. Most toggle keys have an associated
light emitting diode (LED) on the keyboard that lights when the toggle key
is active. To assist users with visual impairments, you can customize the
keyboard to emit an audible notification when a user presses a toggle key.
For example, when you press <keycap>Num Lock</keycap>, you can determine whether
the key is toggled or not toggled by the sound. </para>
      <para>To enable accessible toggle keys, select the <guilabel>Enable Toggle
Keys</guilabel> option in the <guilabel>Filters</guilabel> tabbed section.
When you activate the <keycap>Num Lock</keycap>, <keycap>Caps Lock</keycap>,
or <keycap>Scroll Lock</keycap> keys, the system beeps once. When you deactivate
a toggle key, the system beeps twice.</para>
    </sect2>
    <sect2 id="dtconfig-19">
      <title>To Enable the Repeat Keys Feature</title>
      <para>The repeat keys feature enables you to repeat a keystroke multiple times
without pressing the key more than once. This feature is designed for users
who cannot release keys quickly, for example users who operate a mouth stick.
When you enable repeat keys, you can specify the duration for which you must
press a key before the key starts to repeat.</para>
      <para>To enable and configure the repeat keys feature, perform the following
steps: </para>
      <orderedlist>
        <listitem>
          <para>Click on the <guilabel>Basic</guilabel> tab to display the <guilabel>Basic</guilabel> tabbed section.</para>
        </listitem>
        <listitem>
          <para>Select the <guibutton>Repeat Keys</guibutton> option to enable
the repeat keys feature.</para>
        </listitem>
        <listitem>
          <para>Use the <guilabel>Delay</guilabel> slider to specify the duration
for which you must press a key before the keyboard interprets the action as
a repeat key. If you have difficulty releasing keys, select a long time delay. </para>
        </listitem>
        <listitem>
          <para>Use the <guilabel>Speed</guilabel> slider to
specify the speed at which the keyboard repeats the keypress as input.</para>
        </listitem>
      </orderedlist>
    </sect2>
  </sect1>
</chapter>