Linux Remote Desktop for controlling Windows XP/ Vista / Server 2003 ( rdesktop )

Linux has rdesktop utility.
It is a client for remote desktop protocol (RDP), used in a number of Microsoft products including Windows NT Terminal Server, Windows 2000 Server, Windows XP and Windows 2003 Server.
You do not need to install VNC server.
All you need is rdesktop client on Linux or BSD workstation.

Install rdesktop
$ apt-get install rdesktop

Then,
connect to Windows server called vista.postech.ac.kr, type :

$ rdesktop vista.postech.ac.kr