There are a couple of options.
BEST IMHO is the option just to have another windows login account. Each of my computers has about 5 login accounts. Each MA has their own login and when you hit (windows button)+ L it will lock the screen and go to the windows login screen. Then they can go between their own setup screens.
Another option: Computers are cheap. Get a $100 computer and put a KVM switch that will allow you to jump from one to the other and each is logged in with a different screen so it becomes obvious where you are. KVM switches can be under $35 and switch Keyboard, Video and Mouse seamlessly. Most require you hit screen lock twice or another key combo.
Not to plug them, but I like the site pacificgeeks.com. I have no financial interest, but they frequently have $0.00 t0 $5.00 shipping and a lot of computers with XP pro and cost under $125. Shipping computers can get expensive and they are a good alternative. Anything that can easily run XP can run AC. I have one machine that only has 400 MHz and Win 2000 (which requires less resources) and it is surprisingly fast. I keep it for the immunization program I have loaded on it, but it also has AC.
