I would like to take a minute and describe the different parts and pieces that could potentially make up your RDS environment. We won't be covering the installation or use of all components that might be involved with a full RDS deployment, but you should at least be aware of the components and their intended functions.
Remote Desktop Session Host: This is the most common type of RDS server, as it is the one hosting the programs and sessions that the users are connecting to. Depending on the size of your environment, there may be many of these servers running concurrently.
Remote Desktop Connection Broker: This guy is like the load balancer for RDS servers. It distributes users evenly across Remote Desktop Session Host (RDSH) servers, and helps users to reconnect to existing sessions rather than creating fresh ones.
Remote Desktop Licensing: This one is responsible for managing the licenses that are required for RDS use in a network.