Workflow Remote Desktop Session Host Clients for Windows® Server 2008 r2
When a Windows® Server 2008 R2 client connects to the Remote Desktop Session Host with External Connector Licensing disabled, the license from the client is used. The first time that you connect to the server, that license is activated.
If you are running a non-Windows® Server 2008 R2 client computer, you need to purchase Windows Remote Desktop Services Client Access Licenses (RDSCALs) from Microsoft®. When you first set up the Workflow Remote Desktop Session Host, you have a 120-day temporary license to run a maximum of 10 client machines from the server. The first 10 Windows client machines that connect to the server will reserve the licenses.