I have not heard of any modification to do this. If you are talking about 3 people all logged in *at the same time* using a single account, then you probably want to write a modification that looks at the session table for a single account with mutliple IPs and when it finds one, it.... posts in a Staff forum? You can set it up as a cron job, I would guess. But, as I said, I don't know of an existing one which means you may need to write it yourself or hire someone to do it for you.
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