I believe there's a setting in each of your prefs to allow someone to see whether you are online or not.
That works sort of. If you go to the users list and sort by last online, the ones in yellow have been on in the last 10 minutes, the ones not in yellow but above someone in yellow are online in the last 10 minutes, even though they are set to not show online in the who's on line list.
The "last online" time under each user in the first link is really the last time they logged in, not their last activity, but that doesn't affect the sorting order in the list. Their last activity, the last time they clicked a link, affects the sorting order.
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