As far as I am aware, RE: is not a topic.
 
Also, there are two approaches to the design of
topics: explicit (the "usual" way), and generic.
The latter has been used by HEPROC-L (Carl Reimann).
He pre-defines generic topics to which he assigns
a "temporary" meaning for some length of time.  Once
that topic is finished, it assumes no meaning until
a new conversation thread is assigned it.
 
This allows him to NOT constantly update the headers
with the topics du jour.
 
Or something like that.
 
--  co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
URL:mailto:[log in to unmask]   "I've fallen and can't reach my keyboard"
31 Shields Bldg. --   Penn State    -- University Park, PA 16802-1202 USA