Helmut, The point was calling things that register handlers from the repl which means the repl thread on :spawn mode. If i spawn another thread to call serve-event, my callbacks will never get called. Anyway, this is irrelevant now as fd-handler works. Something else: With slime current from cvs multiple repls in the same image don't seem to work. If i start swank with swank:create-server :port 6666 :dont-close t, and then connect with slime-connect only the first connection creates a repl. Subsequent ones do nothing (this used to work in the past). Also, doing slime-open-listener and including slime-mrepl creates a new listener but 1) slime-presentations do not work in the listener 2) I can only create at most 1 new listener 3) If i press enter on the listener i get: end of file on #<SB-IMPL::STRING-INPUT-STREAM {11A83009}> [Condition of type END-OF-FILE] Restarts: 0: [TERMINATE-THREAD] Terminate this thread (#<THREAD "swank- listener-thread" RUNNING {11A75EA9}>