I agree the best option is simply to purchase another computer.
I don't quite understand the login account with locking, etc. That carried a heavy price, because when the other nurse logs in, it will log OFF the other nurse along with the program. When she/he logs back in, she will have to reopen AC, and this will take up a lot of time and then the other nurse will have to do the same thing. So, I don't about the practicality of that. Fast User Switching with XP and the newer versions would work rather easily. That is kind of what it is for.
If you are going to get a computer for the KVM switch, then why not just connect it directly to your network and have another computer station? Sorry, Wendell, not trying to pick on you. I may be missing something.
BUT, if you really wanted to stay with that one computer, and you wanted AC open twice so you could toggle back and forth in say under three seconds, then you would want Virtual Machine. You can use Microsoft's Virtual PC or VMWare, which I like better. It has a free version, but, of course, Workstation is probably the best, but it isn't free.
With VM, you could run one, two, as many as you want (if you have the memory), but of course, you have to purchase OS for each. But, AC would be running in WIN7 on one while your other nurse using XP Pro or whatever.
