INT 2F - F-PROT v1.x only - F-POPUP.EXE
AX = 4653h
CX = 0004h
BX = subfunction
0000h  installation check
Return: AX = FFFFh
0001h  uninstall
Return: AX,BX,ES destroyed
0002h  disable (v1.08 and below only)
display message (v1.14+)
other registers: ???
0003h  enable (v1.08 and below only)
display message (v1.14+)
other registers: ???
Return: AX = key pressed by user
Note:   F-POPUP is part of the F-PROT virus/trojan protection package by
Fridrik Skulason
SeeAlso: AX=4653h/CX=0005h,AX=CA00h

See also: 2F4653

2F4653CX0004 - F-PROT v1.x only - F-POPUP.EXE