There are lots of tutorials on the web how can this be done. I followed this: https://help.ubuntu.com/community/SeamlessVirtualization but they all are basically agree on what needs to be done. Howerver, when I run my virtualmachine in headless mode:
VBoxHeadless --startvm winxp
and try to connect to it with:
rdesktop -A -s "c:\Program Files\ThinLinc\WTSTools\seamlessrdpshell.exe notepad.exe" 192.168.123.103:3389 -u user -p password
I only get to connect to full windows desktop, not to one application (notepad in this case). I have no idea what is wrong, I only found someone with the same problem here: http://ubuntuforums.org/showthread.php?p=12404643 (He is on Mint, I am on Ubuntu 12.10).