how do RDP clients obtain license from host/license server?

Hi,

I have a W2k8 R2 server setup with Remote Desktop Session Host and Licensing. This will be used to allow more than 2 RDP connections to a server. 

 Can someone explain the process from the client side, getting the license from the host/licensing server, then connect to the server they need to manage?

What configuration is needed on the client/server side to know it needs check for a RDP license?

Thanks in advance,

J