I wrote about this a little while ago and it's rather interesting...

Seemless RDP allows you to run individual Windows applications via RDP (requires rdesktop 1.5) instead of connecting to the desktop. This means you can run notepad, and have an instance of notepad, running on your Windows machine, that is a single Window inside your *nix distro.... Alternatively you can run explorer.exe and you'll have your own Windows start menu, capable of launching Windows programs.. .on Linux.. side by side with your linux applications.