first put this at the bottom of ur Sub JoinGame... or wut ever it's called
MyVar = GetVar("solid_snake-defence.ini", "Anti_Hack", "GetPlayerIP(index)")
If MyVar = 1 Then
Call AlertMsg(index, "Your IP is already registered.")
Exit Sub
Else
Call PutVar("solid_snake-defence.ini", "Anti_Hack", "GetPlayerIP(index)", 1)
then add this in Sub leavegame... or something like tht
Call PutVar("solid_snake-defence.ini", "Anti_Hack", "GetPlayerIP(index)", 0)
make an ini file named solid_snake-defence
then thts it
***************
-Bugs-
everytime u shutdown the server delete everything in the solid_snake-defence ini file
thts all to it