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 twSlide( Direction, sNumber, lShadow )
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     Slides the active window UP, DOWN, RIGHT or LEFT a specified
     number of spaces.

     IF THE WINDOW CARRIES SHADOW INFORMATION, IT IS UPDATED AS THE
     WINDOW SLIDES... if lShadow is TRUE.


       Arguments:

     Direction - 'C' Allowed values are 'U','D','R' and 'L' to indicate
                     the direction in which the window is to move.
                     Diagonal moves may be programmed with the twMove
                     function in a UDF. This MUST be passed.

     sNumber   - 'N' Number of spaces the window is to be slid. The
                     number must be different from 0 for anything to
                     happen. Bounds checking is performed to keep video
                     memory happy.

     lShadow   - 'L' Shadow Update Flag. If .F. the shadow is not
                     updated as the window slides, just at the last
                     position. It can stop screen flicker if it gets
                     bad. It defaults to .T.

       Return:

     Current window handle.

       Example:

     twSlide( "R", 10 )

        Slide the current window 10 spaces to the right.

      twSlide( "U", 6 )

        Slide the current window 6 spaces to the left.