INT 21 - PC Tools 7 VDEFEND - API
AH = FAh
DX = 5945h
AL = function
00h NOP
01h uninstall
Return: CF clear if successful
DI = 4559h
02h ???
BL = ???
Return: CF clear
CL = old value of ???

See also: 2F6282

21FA - PC Tools 7 VDEFEND - API