One instance of Big Business (Single-User or Server) runs ONE company file, which is one set of accounting.
Possible Multi-Company solutions include:
Two company files used in rotation (i.e. not concurrently)
More than one copy of Big Business, for use on more than one computer.
To run multiple copies of Big Business, you need multiple licenses. You will also need a custom, secondary Client or Single-User to avoid the message, "The resource cache file cannot be created." (3686)
One instance of Big Business (Single-User or Server) runs ONE company file.
Possible Multi-Company solutions include:
License one copy of Big Business (Single-User) and create two or more Company files. Quit and relaunch to switch files.
License one copy of Big Business Server and create two or more Company files. Quit and relaunch to switch files.
License more than one copy of Big Business, for use on more than one computer.
License more than one copy of Big Business Server, for use on more than one server computer.
Some combination of the above.
By far, the common solution is one installation of Server for the "main" company and one installation of Single-User for smaller ventures. In this setup, you may run Client to the "main" Server file and Single-User, with a secondary file, on the same workstation.
What if you have two servers and Clients are switching back and forth as needed. Can you install two instances of Client on the same workstation, each connecting to a server? No, not with the regular Client. On launching a second installation of Client, you get the message, "The resource cache file cannot be created."
If you license multiple copies of Big Business, though, we can build a custom, secondary Client or Single-User which can be run conncurrently with the first.