Starbug,
I don't think I am following you. You can have one AC program on each computer and on the front desk and use 50 doctors and see whosever patients you wish. But, what I thought you said was that you are three doctors only in the same office, because you are sharing overhead. You are not bound together as a practice or connected in any way.
If that is the case, then there is no difference between the way you would set it up if you are in one office as if you were ten miles apart. Each doctor (if they are not in the same practice) would have to practice by themselves using a separate Amazing Charts. Yes, it could be done. You could have three computers in each room or use virtual machines, two on each computer so you could run three ACs on each. (You can't run two AC programs on one computer at the same time). They can't even be installed.
I would only need my version open unless I'm seeing one of their patients.
Now this is where it gets interesting. On one hand I am led to believe you are three completely different practices. But, then you say you will be seeing "their" patients. In order for us to give a good answer, I think we need a clearer picture.
If everyone is in the same building with the same name office and the same Tax ID, then you can use one AC. If not, then you will need three different ACs.
Where I think the confusion is, I think you are asking can we all use the same Amazing Charts. It would still be three licenses either way. You can if everyone is in the same group. You can't put three practices into one database. If you download AC, and fill out your practice demographics, it is going to ask you for name of practice, Tax ID, etc. I don't see how you can get around that.
But, given the complexity of the situation, before you give up based on Jimmie and I's advice, I would call AC and see what they say.