Thank you for your question, Dominic. And thank you, Bobby, for your answer.
Generally, what Bobby said was correct. I can only add that in the upcoming release 6.1 the Host module registration will become unnecessary. From then on the Host (and Agent for that matter) will be a "free-floating" module. Instead, you'll need to apply your license key in the Viewer.
For the "per remote PC" license type the Viewer will simply count the number of records in your address book and compare that number with the number allowed by your license key. If it's a free license key, the allowed number is 10.
In other words, if you registered your Viewer with a free license key, the total number of records (or "connections" as well call them) in all your address books combined can be 10 or less. I say address books, plural, because Viewer now allows adding multiple address books, not just one as it used to do.
So it won't matter what remote module you use on the remote side - Host or Agent - and there will be no more such awkward thing as "registering the Agent". We hope that this shift will make it easier for our customers to use the program and to buy it
Let me know if you have other questions.