Dale,
If you go to Administrative Options and under Practice & Users | Practice (Licensing Info), you will see Licensing Information for your Pracice.
Under Licensed Providers, you will probably have a 1 corresponding to you. You may or may not have a paragraph beneath it in red giving you more licensing information. But, if you have more providers than licenses, it will tell you that in red.
Amazing Charts is licensed PER PROVIDER, not how many exam rooms or computers or nurses. The only licenses you will need to purchase will be for actual providers, etc. MDs, DOs, FNPs, PAs, etc. From reading your post, it sounds as though you are the only one practicing, which would mean you would only need one license whether you use one computer or 100 computers, 10 desktops and 10 tablets.