The help of an Expert is needed. As you can see on this page, a kind Expert has helped me to display a list of users presently online: http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/ASP_DOT_NET/Q_22068663.html
However, it doesn't even matter if there's any activity from the user or not. After the 15 minutes has passed, as stipulated in userIsOnlineTimeWindow="15
", the user is removed, regardless of whether or not he/she had any activity. And that really sucks, and this whole daggone Membership and User thing doesn't make any sense at all. So surely Microsoft wouldn't create a stupid thing like that; so I must be the one who's stupid here, and needs to be informed. Hence, I need an Expert to enlighten me. Please do.