There are several videos on videos.xlights.org. Basically xschedule uses the same sync protocol as fpp and they can be used interchangeably. Just create a playlist step on the second computer with the same name as the master and put a video player in it. Then put it in remote mode and the other in master.
I looked for videos on some examples or details on Master/Remote mode and only ever found some high level explanations. I understood how FPP worked but I'm unfortunately not following 100% what you're explaining...sorry. I'll put in a request now for maybe a future video tutorial from you on this

But what I'm trying to do is have a playlist with 4 videos in it loop and play the entire time my show is playing completely separate. The video loop is for my virtual santa scene. I don't want it to stop until my show is coming to the end at night and I want it to start with my show as well. So the remote will only play the 4 videos in loop and will also have a serial connection to the projector that I'll send HEX commands to trigger it to turn on / off. That is all I want it to do. I just need it to run on the as a remote to the Master.
Actually, as I type this I realized that I could just have it run standalone on the same schedule as the other standalone since there is no sync for any specific sequences. Haha. Well, either way, I'd like to see how I'd do it as a remote if I did want to sync a video to the sequence running from the Master if you ever have time to make a short 5 min tutorial video on it.
I also noticed today that you have unicast remote now in there. I'm guessing that's so they can be controlled through a routed connection.
Thanks again Keith!