Int 16 Fn FA00  U - PC Tools V8+ Vsafe, Vwatch - Installation Check        [v]

   AX = FA00h
   DX = 5945h

Return: CF clear
   DI = 4559h
   BX = BIOS hotkey scancode (default 2F00h) (VSAFE only)
       FFFFh if disabled

Note:  MS-DOS 6.0 bundles VSAFE and VWATCH as part of its virus protection

See Also: AX=FA05h,INT 13/AH=FAh,INT 21/AH=FAh"VDEFEND",INT 2F/AX=6282h