But on another note, what if you wrote a client that would send out a group-specific welcome message when connected to, as previously indicated, but instead of refusing the connection based on that message, it would simply remember which hosts that were connected had given that group identifier. That would allow you to create a small sub-group within the network to search. It could even list all the different groups that it was apart of so you could be in multiple groups.

You know, I like this idea.

If anyone would like to discuss this further, please do.