How do I monitor SSH connections?

Many of my co-workers have the ability to SSH into my computer, both at work, and from home. Is there a unix command, or an app on my computer that I can use to monitor who is connected to me?
Also - if someone is messing with me, how can I disconnect them, or quit what they are trying to do?
Thanks!

You can use the command last to see what the login history looks like.
Aso, there are logs:
/var/log/secure.log
you can examine logs in that same folder to see some things, although I can't tell you details.

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