PostMessage( hWnd, nMsg, nParam, xParam ) -> <lHasBeenPosted>
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 PARAMETER:

  <hWnd>        handle of the destination window. If this parameter is 
                HWND_BROADCAST ( -1 ), the message will be posted to all 
                top-level windows, including disabled or invisible unowned
                windows. 
  <nMsg>        message to be posted
  <nparam>      first integer message parameter     
  <xParam>      second message parameter, either numeric or string



 DESCRIPTION:

  PostMessage directs Windows to post a message--that is, place the message
  in an application's message queue. The PostMessage function immediately 
  returns control to the calling application, and any action to be carried 
  out as a result of the message does not occur until the message is read 
  from the queue. 

  PostMessage returns immediately after sending the message, so its return 
  value is only a Boolean value indicating whether the message was 
  successfully placed in the queue and does not indicate how the message 
  was processed.