hello, i was looking in forums about user permissions. i have a few stations and i need them to be secured as much as i can. the ultimate way for me wiil be that the user will be able only to open the web browser and surf not more than that. but i guess its cannot be done . so i will be glad to know how can i forbid form user to : access to terminal, access to folders (c systems) and prevent from deleting files or even write on disk (because then i need to clean it from junk installations and used junked space. that is alot of computers, sometimes they so messed up that i need to reinstall system). or basically every limit that there is on linux . thank you a lot. oh by the i am not a prison manager by the way i am using ubuntu 10.04.... thank you!!