Connection-specific groups

[petermikitsh]

Would it be possible to implement connection-specific groups? If an unauthenticated user visits site_a.mymeteorapp.com and site_b.mymeteorapp.com, I'd want to subscribe to the appropriate documents from some collection, given each hostname. I'm not sure how much work that would be to implement, but I'm curious to see if any other meteor developers would find that to be a huge value-add if this package could deliver that functionality.