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

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

  <info>

    <link type="guide" xref="shell-windows#working-with-windows"/>

    <desc>Check the activities overview or other workspaces.</desc>
    <revision pkgversion="3.8.0" version="0.3" date="2013-04-23" status="review"/>
    <credit type="author">
      <name>GNOME Documentation Project</name>
      <email>gnome-doc-list@gnome.org</email>
    </credit>
    <credit type="editor">
      <name>Michael Hill</name>
      <email>mdhillca@gmail.com</email>
    </credit>

    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
  </info>

<title>Find a lost window</title>
  <p>A window on a different workspace, or hidden behind another window, is easily
  found using the <link xref="shell-terminology">activities overview</link>:</p>

<list>
 <item>
  <p>Open the <em>activities overview</em>. If the missing window is on the
  current <link xref="shell-windows#working-with-workspaces">workspace</link>,
  it will be shown here in thumbnail. Simply click the thumbnail to redisplay
  the window, or</p>
 </item>
 <item>
  <p>Click different workspaces in the
 <link xref="shell-terminology">workspace selector</link> at the right-hand side
  of the screen to try to find your window, or</p>
 </item>
 <item>
  <p>Right-click the application in the dash and its open windows will be
  listed. Click the window in the list to switch to it.</p>
 </item>
</list>

  <p>Using the window switcher:</p>
<list>
 <item>
  <p>Press <keyseq><key xref="keyboard-key-super">Super</key><key>Tab</key>
  </keyseq> to display the <link xref="shell-terminology">window switcher</link>.
  Continue to hold down the <key>Super</key> key and press <key>Tab</key> to
  cycle through the open windows, or <keyseq><key>Shift</key><key>Tab</key>
  </keyseq> to cycle backwards.</p>
 </item>
 <item if:test="!platform:gnome-classic">
  <p>If an application has multiple open windows, hold down <key>Super</key> and
  press <key>`</key> (or the key above <key>Tab</key>) to step through them.</p>
 </item>
</list>

</page>