[mod_python] Interpreters and Filters

According to the 3.0 (and 3.1.2b) documentation, PythonOutputFilter only 
works in the server config (not vhost).  If you have two vhosts (two 
interpreters by default) and a filter from the server config handles a 
request, does the filter have it's own interpreter which handles the 
request or does it run in the interpreter space of the vhost originating 
the request?

-Dan