https://www.ibik.ru/ - multiseat solution not from MS, wouldn't trust it.
https://en.wikipedia.org/wiki/Multiseat_configuration#Microsoft_Windows
https://en.wikipedia.org/wiki/Windows_MultiPoint_Server
It might have been multipoint that I was thinking of.
But if there is one person, using a controller and a keyboard at different times then it will just work, the controller mimics keyboard and mouse commands in effect, it's a simple dual screen setup.
But if you are talking about 2 people doing different things on different screens at the same time, then you have a problem and need additional software.