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 /*!
 
 \page qcop.html
 
 \title QCop Messages
 
 QCop messages allow applications to communicate with each other.
 These messages are send using QCopEnvelope, and received by connecting
 to a QCopChannel.
 
 The <tt>channelname</tt> of channels within Qtopia all start with "QPE/".
 The <tt>messagename</tt> is a function identifier followed by a list of types
 in parentheses. There are no spaces in the message name.
 
 The variable names shown in this documentation are purely for information
 purposes.  A message shown as
 "messageName(Type1 varname1, Type2 varname2, Type2 varname3)" would be
 used in program code as:
 
 \code
    QCopEnvelope e(channelname, "messageName(Type1,Type2,Type2)");
    e << parameter1 << parameter2 << parameter3;
 \endcode
 
 
 The system-wide channels and messages.
 
 <dl>
 <dt><b>QPE/System</b>
  <dd>
   <ul>
     <li>busy()
         <br> Causes a wait indicator to be shown to the user.
     <li>notBusy()
         <br> Cancels the wait indicator.
     <li>linkChanged(QString)
         <br> Sent whenever a link is changed.
             It is sent by FileManager::saveFile() and others, and
             received by the Launcher.
     <li>applyStyle()
         <br> Sent when user changes style.
             It is received by QPEApplication and the application
             will redraw accordingly.
     <li>quit()
         <br> Terminates the Qtopia environment.
     <li>shutdown()
         <br> Terminates the system.
     <li>restart()
         <br> Restarts the Qtopia environment.
     <li>execute(QString)
         <br> Executes or raises the given application.
     <li>execute(QString,QString)
         <br> Executes or raises the given application, passing an argument.
             Note that you should consider using the 
             <b>QPE/Application/<i>appname</i></b> channels described below.
     <li>addAlarm(QDateTime,QCString,QCString,int)
         <br> Internal. See AlarmServer::addAlarm()
     <li>deleteAlarm(QDateTime,QCString,QCString,int)
         <br> Internal. See AlarmServer::deleteAlarm()
     <li>setDefaultRotation(int)
         <br> Internal.
     <li>grabKeyboard(QString)
         <br> Internal.
     <li>timeChange(QString)
         <br> Internal.
     <li>clockChange(bool)
         <br> Internal.
     <li>setScreenSaverInterval(int)
         <br> Internal.
     <li>language(QString)
         <br> Internal.
   </ul>
 
 <dt><b>QPE/Sync</b>
  <ul>
     <li>flush()
         <br> Sent at the start of synchronization. Synchable applications
             should save any synchable data to disk.
             <i>Note: this message is currently asynchronous. Stay tuned
                 to discussions regarding synchronization, as this message
                 may become synchronous, requiring slight midification to
                 your code. For now, just respond in a timely fashion,
                 since the sync server merely waits a small time.</i>
     <li>reload()
         <br> Sent at the end of synchronization. Synchable applications
             should reload any synchable data from disk.
  </ul>
 
 <dt><b>QPE/TaskBar</b>
  <ul>
     <li>message(QString)
         <br> Internal. See Global::statusMessage()
     <li>showInputMethod()
         <br> Internal.
     <li>hideInputMethod()
         <br> Internal.
     <li>reloadInputMethods()
         <br> Internal.
     <li>reloadApplets()
         <br> Internal.
  </ul>
 
 <dt><b>QPE/Card</b>
  <ul>
     <li>stabChanged()
         <br> Sent when <tt>/var/run/stab</tt>, <tt>/var/state/pcmcia/stab</tt>,
                 or <tt>/var/lib/pcmcia/stab</tt> may have changed.
     <li>netUp()
         <br> Sent when a network connection is running.
     <li>netDown()
         <br> Sent when a network connection is available, but not running.
     <li>netUnavailable()
         <br> Sent when a network connection is not available.
  </ul>
 
 <dt><b>Qt/Tray</b>
  This channel allows Qt applications (not just Qtopia applications)
  to show system-tray status in a cross-platform manner,
  but it is not currently supported. See TaskbarAppletInterface for
  a more powerful alternative for system tray applications.
  <ul>
     <li>popup(int,QPoint)
     <li>remove(int)
     <li>setIcon(int,QPixmap)
     <li>setToolTip(int,QString)
     <li>doubleClicked(int,QPoint)
     <li>clicked(int,QPoint)
  </ul>
 </dl>
 
 Each application listens on a channel called
 <b>QPE/Application/<i>appname</i></b>, where <b><i>appname</i></b> is
 the executable name (the application identifier). Standard messages on
 this channel are:
 
 <dl>
  <dt><b>QPE/Application/<i>appname</i></b>
   <ul>
     <li>setDocument(QString)
         <br>Internal. Causes the setDocument(const QString&) slot
             of <a href=docwidget.html>the main document widget</a>
             to be called.
     <li>nextView()
         <br>Applications connected to hardware buttons will receive
             this message if they are already visible.
     <li>raise()
         <br>Internal. Causes the the main document widget and the
             current modal widget to be raised.
     <li>quit()
         <br>Internal. Terminates the application.
     <li>quitIfInvisible()
         <br>Internal. Terminates the application if it is not shown.
   </ul>
 </dl>
 
 The QPE/Application/<i>appname</i> channel has a special property: when
 messages are sent to these channels vie QCopEnvelope, the message is
 delivered even if the application is not yet running (the application
 is run and the message is then sent).
 
 Applications also respond to messages specific to the application.
 Such messages in the base Qtopia applications are:
 
 <dl>
  <dt><b>QPE/Application/helpbrowser</b>
   <ul>
    <li>showFile(QString <i>file</i>)
     <br>Send this message to have the Help Browser show a file.
         The <i>file</i> may be an absolute filename or relative
-        to the system HTML documentation directory ($QPEDIR/help/html).
+        to the system HTML documentation directory ($OPIEDIR/help/html).
   </ul>
  <dt><b>QPE/Application/datebook</b>
   <ul>
    <li>alarm(QDateTime,int)
     <br>Internal. Causes the Calendar application to sound alarms.
   </ul>
 </dl>
 
 */