I have tested playing sound via ssh console and it works with this: https://superuser.com/questions/276596/play-mp3-or-wav-file-via-linux-command-line
I am wondering how to do the same in someone else's session.
Ex.: my son is logged in computer full awake while he sleeps and I would like to play him a army wake up call trumpet so he turns the laptop off. I'm the one paying the electrical bill.
Anyone has an idea. I am stumped!