Although not technically part of Microsoft vdi, RD Session host could be considered the sixth component of rds.
One of the features of Microsoft Windows that enables a user to start and control an interactive session on a distant computer or virtual machine over a network connection is Remote Desktop Services (RDS), also known as Terminal Services in Windows Server 2008 and earlier.
RDS is Microsoft's version of thin client architecture, allowing any remote client device that supports Remote Desktop Protocol to access Windows software and the whole desktop of the computer running RDS (RDP).
User interfaces are shown on the client system by the server, and input from the client system is sent to the server, which runs the software. As opposed to systems that stream computer programmes to the client, like Microsoft App-V, application streaming systems.
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