Arc uses file locking to prevent conflicts. Access to DOS and to editing can be restricted. You can also prevent users from changing their passwords, colour schemes and preferences. Authority levels provide a passive system that requires no interaction from the user after login. The user cannot even see or modify any items with a higher authority than their own.
Passwords provide an active system that requires intervention from the user.
All passwords are comprehensively encrypted. However, if you want to get your hands dirty, Arc allows a batch file of up to 64K for each menu item. Auto installation detects ALL programs and adds them to the menu. It can classify over 360 programs. User-defined help can be added to each menu item, edited and updated on the fly.