Function            MButtonStatus - mouse position and button status

  Syntax              int MButtonRelease(void);

  Prototype in        mousehk.h

  Remarks             determines mouse position and button status
                      information.

                      _mouse2 is a bit field

                           xxxxxxxx xxxxxMRL

                      where

                           M = middle button pressed
                           R = right button pressed
                           L = left button pressed

                      the mouse is at the coordinate (_mouse3,_mouse4)

  Return value        returns the mouse button status information (see
                      _mouse2 above).

  See also            MButtonPress(), MButtonRelease()

  Example             see demomous.c