Seamless

[ ] make it seamless (i.e. without a desktop; the Xpra windows are then integrated into the client's desktop as if they were stand-alone windows)
[ ] use a patched Xdummy to allow virtual screens larger than 2048x2048 (see http://xpra.org/trac/wiki/Xdummy)
[ ] avoid generating a password by using a private/public key pair
[ ] start the Xpra desktop right away, not only the `sshd`
[ ] provide a convenient shell script to connect to the running container