There is a Horus mailing list, where people who are interested in Horus can post questions, answers, and comments. There is fairly little activity on this list (currently, a few messages every month). The Horus mailing list is served by the Cornell mailing list server. To subscribe, send the message
subscribe horus-L <YOUR NAME HERE>to listproc@cornell.edu. Put this in the body of the message, not the subject line.
After subscribing, you can send messages to it using the address horus-L@cornell.edu. To unsubscribe, send the message
unsubscribe horus-Lto listproc@cornell.edu. There are several other features available, including an archive. Send the message ``help'' to listproc@cornell.edu to find out about all this.