|what kind of router youve see (in your friend laptop) ?|
& what is your goal ?
there are many ways to turn your computer to router. It request :
use : linux OS (rh,ubuntu, etc) for best performance & secure, lastest i tried is mikrotik.
use widows server / standard if youre want a wizard/express/instant setup.
It would be nice if you've 4 LAN (RJ 45) in single card. so if you've 5 pci you can manage 20 server/router/clientPC or 20 internet connection.
or use wireless LAN (but i dont know how is Blue tooth can be used for LAN).
& there are also modem which has router inside.
& HUB/SWITCH used for sharing internet connection (you dont have to turn your pc into No.2.
once you turn your desktop to router, you cant playing any games with that :D.