twMCursor( lState )
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     If you use twMCursor() exclusively, you should  have no problems
     with the cursor display. Pass a .T.  to turn on the cursor and an
     .F. to turn it off.

       Arguments:

     lState - 'L' .T. for ON, .F. for off

       Return:

     A logical telling whether the TSDWIN cursor flag indicates ON or
     OFF. If you have trouble with the cursor display, try unhiding the
     cursor again with twMCursorOn().

       Example:

     twMCursor( .T. )