I don't know about Emacs 21 or XEmacs. I do know that occasionally incompatibilities with Emacs 22 arise, because I rely on 22 (old box, no 23). They get fixed. I hope that continues.
-- The Kafka Pandemic: http://thekafkapandemic.blogspot.com/2010/12/welcome-to-kafka-pandemic-two-forces_9182.html I support the Whittemore-Peterson Institute (WPI) === I want to see the original (pre-hold) Lo et al. 2010 NIH/FDA/Harvard MRV paper.
