Finally, I was able to play #HLAlyx on #SteamFrame, streaming from #SteamMachine! Both devices need to be on the beta channel, as does SteamVR. You also need to launch SteamVR in desktop mode first. I also needed to replug my streaming dongle. Then start Alyx and it should work. Well, it actually crashed after around 30 minutes, but it's better than nothing! :-) I will try again soon. :-)