What is Remote Desktop Services?
RDS stands for "remote desktop services" and refers to the functionality enabling users to work with graphic desktop and Windows applications via remote access.
Do I need a Client Access License?
A client access license (CAL) is needed for each user and device that connects to a Remote Desktop Session host. An RDS licensing server is needed to install, issue, and track RDS CALs. When a user or a device connects to an RD Session Host server, the RD Session Host server determines if an RDS CAL is needed.