A Remote Desktop Services CAL is necessary for any user or device that connects to a Remote Desktop Session host server using per-device licensing.
The User CALs permits an unlimited number of connections from one user per CAL to an RD Session host server from client computers or devices, or in the case of Device CALs, an unlimited number of connections from one computer or device per CAL.
Using a license server system, such as Sentinel RMS network licensing, is one approach to ensure that this scenario never occurs. Businesses and organizations can lower the cost of software deployment and administration with the RMS license configuration choices, making it a requirement.
How do I check my server CALs 2016?
The Remote Desktop Licensing Manager tool generates reports that track the RDS Per User CALs issued by a Remote Desktop license server.
To generate a per User CALs report, follow these steps:
In Remote Desktop Licensing Manager, right-click the license server and select Create Report, then CAL Usage.
The report is generated, and a message confirms that it was successful. Click OK to close the message.