Two TestCompletes Network Connection
Any computer that has a TC license can create or run tests. There won't be anything special in TC that you have to set up if you want to designate one computer for creating tests and one for running them. If you want your two computers to access the same tests, then just make sure that they both have access to the same folders in Windows. Alternatively, you can have your tests in source control and commit/retrieve them that way.
A floating license is used when you want to share one license amongst multiple users. It's not related to working over a network.