MONOCHROME()
 Switches to the monochrome mode
------------------------------------------------------------------------------
 Syntax

     MONOCHROME() --> lSwitched

 Returns

     MONOCHROME() returns .T. when the screen adapter successfully changes
     modes.

 Description

     This function can be used on any screen adapter capable of emulating a
     monochrome card.

 Notes

     Important!  This function cannot be used when windows are open.

     .  MONOCHROME() sets the BIOS mode to 7.

     .  This function cannot be used with a second monochrome monitor
        (Hercules).

 Example

     Switch to monochrome mode:

     ? MONOCHROME()                  // .T., if successful