Int 2F Fn FF00  - Topware Network Operating System - Installation Check    [N]

   AX = FF00h

Return: AL = status
       00h not installed, OK to install
       01h not installed, not OK to install
       FFh installed

See Also: AX=FF01h,AX=FF02h,AX=FF10h,INT 21/AX=FF00h"Topware",INT 7A"Topware"