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/usr/share/help/C/gnome-help/shell-lockscreen.page is in gnome-user-guide 3.8.2-1.

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<page xmlns="http://projectmallard.org/1.0/"
      type="topic" style="task"
      id="shell-lockscreen">
  <info>

    <link type="guide" xref="shell-overview#desktop" />

    <revision pkgversion="3.6.1" version="0.1" date="2012-11-11" status="review"/>

    <credit type="author copyright">
      <name>Michael Hill</name>
      <email>mdhillca@gmail.com</email>
      <years>2012</years>
    </credit>

    <desc>The decorative and functional lock screen conveys useful information.</desc>
  </info>

  <title>The Lock Screen</title>
  <p>The lock screen means that you can see what is happening while your computer
 is locked, and it allows you to get a summary of what has been happening while
 you have been away. The lock screen curtain shows an attractive image on the
 screen while your computer is locked, and provides useful information:</p>
  <list>
    <item><p>the name of the logged-in user</p></item>
    <item><p>date and time, and certain notifications</p></item>
    <item><p>battery and network status</p></item>
    <item><p>the ability to control media playback - change the volume, skip a track or pause your music without having to enter a password</p></item>
  </list>

<p>To unlock your computer, raise the lock screen curtain by dragging it upward
with the cursor, or by pressing <key>Esc</key> or <key>Enter</key>. This will
reveal the login screen, where you can enter your password to unlock. You can
also switch users if your computer is configured for more than one.</p>

</page>