In OC1 you can do computer.addUser("username") and it would create a whitelist of players that only allows those players to interact with the computer through the screen, however this is almost completely useless because other players could just right click and open the computer case and access the hardware components of the PC. My suggestion is to also make it to where only whitelisted users (if any) can interact with the computer case or it's inventory while also including the ability for OP'd players to bypass this protection.