How two detect that the same users authenticated from different network?
<p>I am using ASP.NET forms authentication, is it possible to detect that two of the same login logged in?</p>

<p>I want this to prevent a situation that two users on the same account modify the same thing. so i want to notify the user that another user of the same login name is already inside the system.</p>

<p>I am also using MemberShip model of .net to authenticate if this helps.</p>
