Microsoft have released a nice poster showing all the components of Remote Desktop Services and how they all fit together. Unfortunately I don’t have an A3 sized printer, but i am sure there are companies out there who can print it for me 
It contains the following components:
Remote Desktop Session Host
Remote Desktop Virtualization Host
Remote Desktop Connection Broker
Remote Desktop Web Access
Remote Desktop Gateway
Remote Desktop Licensing
RemoteFX
It can be downloaded here: