Remote Desktop Services or RDS Server Licensing is required by each user and device who wants to connect to an RDS Session host. It needs a CAL license, and if a viable RDS CAL is available from a license server, it gets issued to the client, who can further connect. And from there, it gets connected to the desktop or apps they are trying to use. In this comparison chart, we have compiled the versions of RDS in a compiled version for you to determine which will suit your organizational needs best.