twScBarMove( _SBar, sTop, sLeft, sBottom, sRight )
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     Moves the scroll bar display to another position on the screen.
     This function is used in twARPick and twDBPick when the window is
     moved with the corresponding ALT keys.

       Arguments:

     _sBar   - 'N' Bar Array

     sTop    - 'N' Spaces to move bar top.

     sLeft   - 'N' Spaces to move bar column.

     sBottom - 'N' Spaces to move bar bottom.

     sRight  - 'N' Spaces to move bar column.

       Return:

     Bar number.


       Example:

     twScBarMove( nBar, -1, 0, -1, 0 )

     Moves bar up one space.