Note: in the following machine-name is the network name of your windows box (either real or virtual).
apt-get install rdesktop
rdesktop -g 1024×768 -k de-ch -u user -p password machine-name
To enable seamless RDP mode (running applications without a desktop, taskbar etc.) you need a small server side component is available as open source from Cendio (http://www.cendio.com/seamlessrdp/):
rdesktop -A -s “c:\seamlessrdp\seamlessrdpshell.exe notepad” machine-name. If you get a full screen windows display with no notepad running, remeber to enable “Welcome screen” and “Fast user switching”.