SetWndDefault( <oWin > ) -> <nil>

------------------------------------------------------------------------------


 PARAMETER:

  <oWin>       window object that will be the choosen one

 DESCRIPTION:

  You can store your window object as the default window with this function.
  Normally you will do this with a file wide static var 'oWnd' or so. 
  SetWndDefault() and GetWndDefault() offer you a SETGET way 
  to do this, with the big advantage that you can access this window object
  from other .prg files also :

     +-------------------------------------------------------------+
     |  /* setGet the window */                                    |
     |  DEFINE WINDOW oWin FROM ...                                |
     |  SetWndDefault( oWin )                                      |
     |  [ ... ]                                                    |
     |  RETURN ..                                                  |
     |                                                             |
     |  FUNCTION WhatSoEver()                                      |
     |     LOCAL ;                                                 |
     |        oWin := GetWndDefault()                              |
     |                                                             |
     +-------------------------------------------------------------+