Without "any 3rd party apps", I'll write no.
I found TightVNC to be quite easy, but that's not up for discussion, is it?
I have a user who has Windows 2000pro on her work computer and home pc. I have installed MS's RDP client on her home pc, but am unable to access her work computer via our VPN.
I don't want to go to any 3rd party apps because the learning curve for this user is a rocky road....