I connect to my Mac at work quite frequently when I'm home, and I found something interesting. At work, I have a fixed IP address...except when I need a VPN connection to access certain servers that I administer. When I connect to the VPN, I get a different IP address that's dynamically assigned (i.e., I never know the exact address, only the subnet).
Given the snow storm on the East Coast, I worked from home and connected to my Mac at work. I had forgotten to terminate a VPN connection I had going the previous day, but I was able to connect to my Mac anyway, even though I entered my Mac's usual address when I connected, rather than the VPN-supplied address.
Even more startling was that I maintained my connection even when terminating the VPN connection. To confirm, I restarted the VPN connection on my remote Mac, yet I didn't lose my remote session. In the past, I would have to reconnect, hoping I had properly guessed my Mac's VPN-assigned address.
Just another example of thoughtfulness from Apple.

