Int 2F Fn AF00 - Windos V2.11 - Installation Check [O] AX = AF00hReturn: AL = FFh if installedProgram: WinDOS is a DOS clone (claimed to be mostly MS-DOS 5.0 API compatible) written by Heiko GoemannSee Also: AX=AF01h"WinDOS",INT 21/AH=30h