INT 2F - F-PROT v1.x only - F-XCHK.EXE AX = 4653h CX = 0003h BX = subfunction 0000h installation check Return: AX = FFFFh 0001h uninstall Return: AX,BX,ES destroyed Note: F-XCHK is part of the F-PROT virus/trojan protection package by Fridrik Skulason SeeAlso: AX=4653h/CX=0004h,AX=CA00h