SetIdleAction( bIdleAction )-> <nil>
------------------------------------------------------------------------------


 PARAMETER:

  <bIdleAction>  Is a codeblock to execute during idle periods. If 
                 SetIdleAction() is called without parameters, it will
                 stop any previously defined idle action.



 DESCRIPTION:

  SetIdleAction will launch a defined action every time that windows
  is in an Idle state. It is very important that you don't process large
  and time consuming functions here, or you will freeze the system !
  Don't confuse idle periods with timers. Idle periods are those during
  there are no pending messages to process. As soon as the application
  starts processing messages again, all idle actions are paused.


 EXAMPLE:


    +--------------------------------------------------------------+
    |  /* Play a tone during Idle Actions */                       |
    |   SetIdleAction( { || tone( 1000, 1 ) } )                    |
    |   [ .. ]                                                     |
    |  /* Cancel the action */                                     |
    |   SetIdleAction()                                            |
    +--------------------------------------------------------------+