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/usr/share/help/C/modem-manager-gui/usage-modem.page is in modem-manager-gui-help 0.0.18-3.

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<page xmlns="http://projectmallard.org/1.0/"
      xmlns:e="http://projectmallard.org/experimental/"
      type="guide"
      id="usage-modem">

  <info>
    <link type="guide" xref="index#usage"/>
    <revision pkgversion="0.0.17" version="0.1" date="2014-01-05" status="incomplete"/>
    <desc>
      Activate your modem devices.
    </desc>
    <credit type="author">
      <name>Mario Blättermann</name>
      <email>mario.blaettermann@gmail.com</email>
    </credit>
    <license>
      <p>Creative Commons Share Alike 3.0</p>
    </license>
  </info>

   <title>Modems</title>
   <p>After starting <app>Modem Manager GUI</app>, the following window will be displayed:</p>

   <figure>
    <media type="image" mime="image/png" src="figures/startup-window.png">
      The startup window of <app>Modem Manager GUI</app>.
    </media>
   </figure>
   
   <p>You can see the modem devices available on your system. Click on one of the entries
     to use that device.</p>

   <p>After clicking on a device, it might be needed to activate it first, if it was not
     otherwise activated on your system. <app>Modem Manager GUI</app> will ask you for
     confirmation in that case.</p>
   
   <p>Be patient after connecting a removable device such as an USB stick or PCMCIA card.
     It may take a while until the system detects it.</p>
   
   <note style="hint">
     <p>You cannot use multiple modems at the same time. If you click on another entry in the
       device list, the previously activated one will be disabled.</p>
   </note>
      
      
</page>