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=0002h,AX=4653h/CX=0004h,AX=CA00h
Index:  installation check;F-XCHK|uninstall;F-XCHK

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