CAL (Client Access License) is the authorization to access the server and use its services. A CAL is not software.   Remote Desktop 2022 User CAL If you want to access the Windows Server 2022 from outside, you need a so-called Remote Desktop Service CAL , which is abbreviated as RDS CAL. This is a fixed part of the Microsoft licensing model that allows external access . With a Remote Desktop 2022 User CAL it is possible to access the Win Server Standard 16/24 Core or the Win Server 2022 Datacenter 16/24 . As with the Win Server 2022 Standard User CAL , access is bound to a user, not to the device used . This makes it best suited for users who regularly work on a specific endpoint device and thus need to access the server directly or indirectly. What about the RDS User CAL? The RDS 2022 User CAL allows remote access to the Windows Server 2022 . In other words, the license allows you to use the available functions and retrieve corresponding data. Since it is a per user access ...