How to See What Users Are Connected & Logged In To a Mac
If you share your Mac on a network you may be interested to know who is connected to the Mac at any given time. This may include listing currently logged in users through a variety of network protocols, even locally, or perhaps just a history of users logins over a period of time. While Mac OS X Client doesn’t offer the same level of information as Mac OS X Server, you can still find user connection details by using a variety of tools built into all versions of Mac OS X.