The -s switch on the SSH command line indicates that the server should start a subsystem.
The equivilent way of doing this in our client is to get hold of an Ssh2Session instance
Ssh2Session session = (Ssh2Session) ssh.openSessionChannel();
Then call its startSubsystem method
session.startSubsystem("xmlagent");
The InputStream/OutputStream of the session can then be used to communicate with that subsystem.
