Intel has unveiled its Thunderbolt Share technology, which utilizes the bandwidth on offer from Thunderbolt 4 and 5 ports to share and sync data, and control two PCs with one keyboard and mouse.
(Image credit: Intel)It's not the first way to link two PCs. I've used crossover cables in years past, and I recall using a USB link device about a decade back, but this method looks like it will be the easiest way yet to link two PCs together. It's not quite a plug and play solution though, as it will need a software app to work.