: It translates graphical user interfaces into data packets sent via RDP to remote clients.
sfc /scannow
If you need a safe, license-compliant method for multi-session RDP on Server 2019, let me know and I can outline the setup instead. termsrvdll windows server 2019
A deep discussion of termsrv.dll would be incomplete without addressing licensing. By default, Windows Server 2019 allows (for remote management). For more than two sessions, an RDS CAL is required. termsrv.dll enforces this by: TermSrv