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 _twM6C( nB )
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     Get X coordinate of Last Button Release of the requested button.
     Use 0 for the left button and 1 for the right.

       Arguments:

     None.

       Return:

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

       Example:

     nMouseX := _twM6C( 0 )  // for the left button