There are some additional things clients may need to do to make this most effective, but I think that would have to happen regardless of what solution is utilized. Mr. Hildebrand suggested some based on presence, and I think clients may also need to consider a full-JID recipient stale after several moments of inactivity (e.g. leave the chat window open "forever" but only actually have short bursts of activity between long periods of silence). However, I don't see these behaviors having a negative effect on the user experience. If anything, it would most likely improve it by making it even more obvious that a conversation is waking up.
-- Matthew A. Miller [EMAIL PROTECTED]
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