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 _twM6D( nB )
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     Get Y coordinate of Last Button Release of the requested button.
     Use 0 for the left button and 1 for the right.

     None.

       Return:

     Y coordinate in virtual screen coordinates of the position of the
     mouse cursor the last time the specified button was released.

       Example:

     nMouseY := _twM6D( 0 )  // for the left button