a person in the workplace who refuses to leave his/her computer screen for lunch or any other break
Joe is such a screen slaver; he eats at his desk every day.
The control applied in large corporations that remove PC users' rights to change their PC wallpaper and/or screen saver. Usually the company logo is both and cannot be edited or changed.
I hate or PC Support team. Everytime they address a technical problem they reset my Wallpaper - fuckin' SCreen Slavers.