Remote Access to allow me to "see" the screen of another Mac?

Question

I initially posted this in another forum but maybe it makes more sense here:
My parents live out of state and frequently have questions for me about how to undo something they've done on their eMac. I end up struggling for an hour with what they're trying to explain to me, when I know that if I could see their screen, I could help them.
At work, my out-of-state IT department can access my PC and see what's on my screen. I know there's a way to do this on Windows boxes with logmein.com, but is there a way to access my parents' eMac from my iMac the same way- not just access the files, but "see" on my screen at home what they're seeing on theirs- wallpaper, screen saver, dock, Finder, etc? If so, what do I need?

Answer 1

I'd also like to thank Duane and Malcolm. I have set it up as suggested and it works through the router.
So Dave, you should have even less problem. The Bombich software is all that your parents need. They should know that in the SMD dialog box, the area to the left of the IP address and Port is a buttton marked something like 'Start sharing' and when they click it, a password will appear. They will then have to tell you the password.
Our broadband screen update was v e r y s l o w, so be warned.
Also, a small problem is that the password is very random characters, and when you enter it at your end you don't see the characters, only dots. The first few times we tried it the password contained hash symbols and @ signs, (which on UK keyboards do not have direct keys) and we had difficulty distinguishing a lower case l from a 1. Best is to have a text chat going and use the fact that the Bombich software automatically copies all of the info (IP address, port and password) to the clip board, so it can simply be pasted into the chat. Don't have a video chat or there will be no bandwidth at all for screen updates.
Andrew