Windows Server Remote Desktop Services
Remote Desktop Services (formerly known as Terminal Services) accelerates and extends desktop and application deployments to any device, improving remote worker efficiency, while helping to keep critical intellectual property secure and simplify regulatory compliance. Remote Desktop Services enables virtual desktop infrastructure (VDI), session-based desktops, and applications, allowing users to work anywhere.
Each user and device that connects to a Remote Desktop Session host needs a client access licenses (CAL). You use RD Licensing to install, issue, and track RDS CALs.
User CAL: A user CAL entitles a particular user to use any number of devices, e.g. Company PC, private PC, mobile phone, etc., from which he can access the server software.
Device CAL: A device CAL licenses a device for use by any number of users who are allowed to access instances of the server software from this device.