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The TS role is split into five parts called role services. Each role service performs its own unique function and each is explained in this section.


Terminal Server
A server with the Terminal Server role service installed is referred to as a terminal server. It hosts the Remote Desktop sessions and the Windowsbased applications that are made available to your users.


TS Licensing
Each connection to a terminal server requires a TS client access license also known as a TS CAL. There are two types of TS CALs: TS Per Device CALs and TS Per User CALs. If Per Device licensing is chosen, you will need to purchase a CAL for each device in your enterprise that may be used to access your TS infrastructure. This can be a more economical choice if you have more users than computers in your enterprise. Per User licensing requires you to purchase a CAL for each user that may access your TS deployed applications or desktops. This is often the choice made by companies whose employees need to make a TS connection from a variety of different machines. It is highly recommended that you consult with a Microsoft licensing specialist when deciding which path is right for you. TS CALs are managed by a TS Licensing server, and you are required to have at least one in any TS infrastructure. If you implement a large TS environment with multiple terminal servers, it is recommended that you install TS Licensing on a separate server. However, if you are implementing a TS environment with a small footprint or just for testing you can install TS Licensing on a server running the Terminal Server role. For more detailed information on the installation and configuration of TS Licensing you can go to http://go.microsoft.com/fwlink/?linkid¼85873.


TS Session Broker
The TS Session Broker serves two purposes in a TS environment with a farm of terminal servers. The first is TS Session Broker Load Balancing. When this feature is enabled, the TS Session Broker monitors the number of TS sessions open to each terminal server and directs new session requests to the server with the fewest open sessions. This allows for an even distribution of sessions across all servers in a farm. The second function provided is the ability to ensure a TS user is automatically
reconnected to their active session, if one exists. TS Session Broker tracks information on all open sessions within the farm, recording which user sessions reside on which terminal server. This allows a user to pick up where they left off if their session is unexpectedly disconnected. More detailed information on the installation and configuration of TS Session Broker can be found at http://go.microsoft.com/fwlink/?linkid¼92670.


TS Gateway
By leveraging TS Gateway, a TS environment and computer with Remote Desktop enabled can be configured to be accessible by authorized users over the public Internet without the need for an additional secure method to access your internal network such as a Virtual Private Network (VPN) connection. This is done by establishing an RDP over HTTPS connection from an Internet connected computer over port 443 versus the standard RDP port 3389. Security settings for this access are configured via TS Gateway Manager and include the ability to define several parameters, such as authorized Active Directory user and computer groups, accessible network resources, device and disk redirection, and acceptable authentication methods like passwords or
smart cards. For TS Gateway installation information and a step-by-step installation guide, you can go to http://go.microsoft.com/fwlink/?linkid¼85872.


TS Web Access
TS Web Access makes available from a web browser the applications you publish with the traditional TS methods, such as RemoteApp programs and virtual desktops. You can choose to limit the access to the TS Web Access Web site to your local intranet or use it with TS Gateway as another way to enable your users to access TS applications from across the public Internet.

Source of Information : Elsevier-Microsoft Virtualization Master Microsoft Server Desktop Application and Presentation