I've used KRDC / KRFB for computers in my house. But now, I need to access a
computer over the Internet. Can it be done with these programs or must I use
something else?

From what I understood, it worked in the house because it was accessing any
computer connected to the same router. I now need to access a computer in
Florida. It, like me, also has Kubuntu 10.04.

What clients would I need if these do not do the job. Or, if these can do it
then how? I know that somewhere in there, I'll need to give the computers IP
address. Would these client take care of that?