NAME 
        WBenchToBack -- Send the Workbench screen in back of all screens.

    SYNOPSIS 
        Success = WBenchToBack()
        D0

        bool wbenchtoback( void );

    FUNCTION 
        Causes the Workbench screen, if it's currently opened, to go behind
        all other screens.  This does not 'move' the screen up or down,
        instead only affects the depth-arrangement of the screens.

    INPUTS 
        None

    RESULT 
        If the Workbench screen was opened, this function returns TRUE,
        otherwise it returns FALSE.

    BUGS 

    SEE ALSO 
        wbenchtofront(), screentofront()