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   MESSYN()        Windowed YES/NO (or other 2 prompts)
     Purpose       POPS UP A WINDOW, DISPLAYS A MESSAGE AND DOES A
                   MENU TO ON AN EITHER/OR PROMPT
     Usage         MESSYN(<MESSAGE>,<TOP>,<LEFT>,<PROMPT1>,<PROMPT2>)
             or    MESSYN(<MESSAGE>,<PROMPT1>,<PROMPT2>,<TOP>,<LEFT>)

     Example             if messyn("Are you done")
                   or    if messyn("Are you done",10,10)
                   or    if messyn("Are you done",10,10,"Not yet","Almost")
                   or    if messyn("Are you done","Not yet","Almost",10,10)
                   or    if messyn("Are you done","Not Yet","Almost"
     Returns       .T.  for first prompt, .F. for 2nd prompt
     NOTE          TOP/LEFT AND PROMPT1/PROMPT2 PARAMS ARE OPTIONAL
                   AND CAN BE IN EITHER ORDER. DEFAULT TOP/LEFT IS
                   CENTERED ON THE SCREEN. DEFAULT PROMPTS ARE 'YES'
                   AND 'NO'.