Back in 90s and at the age of 16, I tried to connect our two computers - This Pentium 3 and an older Celeron using coaxial cables.
I was not successful.
Now at the age of 20+ something, I have discovered Ubuntu and I am now trying to connect 3 PCs.
1. This old Pentium 3
2. A slightly younger Pentium 4
3. A slightly younger Celeron
We now have a network switch and some ethernet cables.
My sisters and I managed to play Tremulous! Unfortunately this was on Windows.