Int 21 Fn FA  U - Pc Tools V7+ Vdefend, Vsafe, Vwatch - Api                [v]

   AH = FAh
   DX = 5945h
   AL = function (00h-02h for VDEFEND, 00h-07h for VSAFE and VWATCH)

Return: varies by function

Note:  this API is identical to the API on INT 13/AH=FAh and INT 16/AH=FAh,
     so it is listed in its entirety only under INT 16/AX=FA00h and
     following

See Also: INT 13/AX=FA00h,INT 16/AX=FA00h