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  MSISON()                                                    Mouse Function
 Purpose..: Check whether a mouse is turned on
-------------------------------------------------------------------------------
 Syntax...: MsIsOn( ) --> lIsOn

 Arguments: none      

 Returns..: lIsOn is true if the mouse is active.

 Source...: MSISON.C
-------------------------------------------------------------------------------
 Example..: . The example checks whether the mouse is active. If
              not, it prints a message.

            if !MsIsOn()
               ? "Mouse is inactive or not installed..."
            endif