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 twMBPress( nButton, nPress, nX, nY )
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     Retrieve button press information for a particular mouse button.
     This function calls _twM5?() and so resets the internal counters
     for button presses when it is called.

       Arguments:

     nButton - 'N' button number: ( 0 - Left, 1 - Right )

     nPress  - 'N' The number of times the button was pressed since the
                   last call to this routine. This parameter is passed
                   by reference.

     nX      - 'N' X coordinate of the mouse cursor when the last press
                   occurred. This parameter is passed by reference.

     nY      - 'N' Y coordinate of the mouse cursor when the last press
                   occurred. This parameter is passed by reference.

       Return:

     1 if the button is down, 0 if it is released.

       Example:

     IF twMBPress( 1, @nNoPresses, @nMouseX, @nMouseY )
         // do something using the press number or the coordinates.
     ENDIF