I've used DND mode on ICQ when I've been online and just not wanted to talk to people. I leave it on all the time incase someone desparately needs to get me for some reason and can't get my cell or anything else. DND usually means "i'm here at the computer and working and I need utmost concentration for the moment" Friends who use it at work use DND as a way of saying "i'm in a meeting - don't want to get an 'uh oh' when the boss is in here"
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