It is best to use a VPN so that you can create a secure tunnel to your location. Be warned, however, that opening ports to the Internet is dangerous. This port forwarding is the same for any other port forwardwing requirement. UltraVNC (and the likes) don't have the functionality to automate the routing out the the Internet so you have to manually forward ports on your router to the computer you wish to control.
Notice on TeamViewer that, to connect to a remote machine, you have to enter a unique ID and PIN? This is, essentially, the telephone number of the remote device that your remote user tells you and then gives you the PIN to ensure the connection is private to only those who know the PIN.
Much like a telephone exchange - you dial a number and the exchange (which isn't at your location) makes the connection to the recipient. UltraVNC (like many other VNC applications) doesn't have the capabilities as TeamViewer because TeamViewer (and the like) route themselves out to the Internet over HTTPS (so they can circumvent firewalls) but, and the most important thing to remember about the likes of TeamViewer is that they are clients that connect to a remote management server that deals with the connection requests and then makes the connections between users.
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