PROXY Pro Host can be configured to allow remote viewing and remote control of one or more simultaneous Remote Desktop Services sessions, as well as the Remote Desktop Services server console. A standard PROXY Pro Host with a special RDS license key must be installed and configured on the server console to serve as the "root". When a new RDS session is started, it will execute the Startup procedure inherited from the server console, which includes a task to start a Host service. PROXY Pro Host will distinguish the session from the server console and start up a Host service specifically for the session.
See "Host for RDS in section 5. Host Types" for complete information.