LogonSessions

Enumeration Windows Sysinternals

If you think that when you logon to a system there's only one active logon session, this utility will surprise you. It lists the currently active logon sessions and, if you specify the -p option, the processes running in each session. LogonSessions works on Windows 2000 and higher.

http://technet.microsoft.com/en-us/sysinternals/bb896769.aspx

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