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/** \mainpage Dual Communications Device Class Device (Dual Virtual Serial Port)
 *
 *  Dual Communications Device Class demonstration application.
 *  This gives a simple reference application for implementing
 *  a compound device with dual CDC functions acting as a pair
 *  of virtual serial ports. This demo uses Interface Association
 *  Descriptors to link together the pair of related CDC
 *  descriptors for each virtual serial port, which may not be
 *  supported in all OSes - Windows Vista is supported, as is
 *  XP (although the latter may need a hotfix to function).
 *  
 *  Joystick actions are transmitted to the host as strings
 *  through the first serial port. The device does not respond to
 *  serial data sent from the host in the first serial port.
 *  
 *  The second serial port echoes back data sent from the host.
 *  
 *  After running this demo for the first time on a new computer,
 *  you will need to supply the .INF file located in this demo
 *  project's directory as the device's driver when running under
 *  Windows. This will enable Windows to use its inbuilt CDC drivers,
 *  negating the need for custom drivers for the device. Other
 *  Operating Systems should automatically use their own inbuilt
 *  CDC-ACM drivers.
 *
 *  <table>
 *   <tr>
 *    <td><b>USB Mode:</b></td>
 *    <td>Device</td>
 *   </tr>
 *   <tr>
 *    <td><b>USB Class:</b></td>
 *    <td>Miscellaneous Device Class</td>
 *    <td>( Sub-Interface: Communications Device Class (CDC) )</td>
 *   </tr>
 *   <tr> 
 *    <td><b>USB Subclass:</b></td>
 *    <td>Common Class</td> 
 *    <td>( Sub-Interface: Abstract Control Model (ACM) )</td>
 *   </tr>
 *   <tr>
 *    <td><b>Relevant Standards:</b></td>
 *    <td>USBIF Interface Association Descriptor ECN</td>
 *    <td>USBIF CDC Class Standard</td>
 *   </tr>
 *   <tr>
 *    <td><b>Usable Speeds:</b></td>
 *    <td>Full Speed Mode</td>
 *   </tr>
 *  </table>
 */