Community in this sense is the concept that OpenACS is the toolkit for online communities.
I was referring to this procedure http://www.openacs.org/api-doc/proc-view?proc=acs%5fcommunity%5fmember%5furl
or someting like it, I did not go poking around in bug-tracker.
I guess the analogous thing in openacs to a .LRN community is a subsite and all the packages underneath it.
If you have two bugtracker instances in the main subsite, you don't have to worry about it.