Some newer vers. of "Winders(tm
)" have a remote desktop client built in.
My girl friends W2k Pro box does not. I installed TightVNC there, & access it w/ (KDE) Remote Desktop Connection (krdc). Works pretty well, sometimes slow.
KDE Remote Desktop Connection can also connect to KDE Remote Desktop Client. I don't know what Gnome has to offer. You can always install a free VNC.
Tell us what you're working w/, & we'll be able to advise better.