The short answer could have been "utilize analog and digital inputs" but my case here is quite old system having only one input.
I didn't really look into this question until I had to, today.
Some days before, when I was experiencing troubles with sound in Steam I installed pulseaudio and during search for it noticed "network" word in description. So I thought maybe I can set it up so I will send sound from second computer to first(over gigabit home LAN), which...