I did this on Gentoo around 10 years ago. It was quite cumbersome, but it worked. Separate X sessions in time of xorg.conf. The problem was with sound, I didn't

I did this on Gentoo around 10 years ago. It was quite cumbersome, but it worked. Separate X sessions in time of xorg.conf. The problem was with sound, I didn't know how to divide it, also removable media and danger of shutting down computer when another session was still running. Today it would be probably easier.