In most cases, passing the RDP protocol (TCP port 3389) through the corporate firewall is a lot easier than having to allow Microsoft Management Console snap-ins (MMC) or other types of management tools that use RPC and other protocols through the firewall.
HOW TO RDP TO SERVER 2003 FROM SERVER 2008 FULL
There is not full desktop capability, and when the application is closed, the session ends. After logging on, users gain access to the published application and only to that application. Users click on their published application shortcut (which can be a desktop icon or an Internet shortcut, depending on the method used to publish the applications).