Yes, RDP is actually more like sending commands to a remote GPU. VNC and the others are, as far as I know, just doing screen-capture and then possibly some compression on the resulting video stream.
The RDP specifications are partially documented by MS, and even the publicly available parts are huge.
The RDP specifications are partially documented by MS, and even the publicly available parts are huge.
https://learn.microsoft.com/en-us/openspecs/windows_protocol...
https://learn.microsoft.com/en-us/openspecs/windows_protocol...