Hello, Maris! It's important to understand that with most web applications there is no such thing as an "active session" kept by a web server. Every time time you click a button, your browser "re-login" behind the scenes to Portal. LID on the other hand uses TELNET (on UNIX) to login - which is persistent-session protocol. The bottom line - by analyzing web logs you can say that someone is in Portal with some PROBABILITY (e.g. they accessed something 5 seconds ago), but you CANNOT determine definitely that a user has web browser open with Portal screen on it.
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