Can you use screen sharing outside of your local network?

I've been poking around with the "screen sharing" in osx Lion. I have a few questions about it.
Firstly, is the built-in screen sharing only accessible through the finder?
Also, is it only available on local networks? I've gotten it to work on two computers on the same network. But, can I use in the built-in screen sharing to look at my work iMac while I'm at home on my Macbook? Or would I need a full VPN client to do this? (Although isn't there built-in VPN compatibility in Lion?)
Thanks!

Go here..
https://discussions.apple.com/message/16439571#16439571
... and read my post explaining the different ways to share your screen.  Things should be a little clearer for you, I hope.
Bob

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