^ you mean like 1 connection, like what your $20 wireless router does by design. I creates 1 connection to the network and then shares it with wireless devices and or wired devices making it look like 1 connection via NAPT.. Using only 1 IP address - you mean like that 1 connection per user?
What network are you on that limits your connection to 1 user? School -- I would guess school?
Are you talking like intel my wifi that has your wireless card look like 2, and can fire up a hotspot? That was hot tech back in what 2007, 2008? Why don't you just carry around something like this if you need portable functionality to provide wireless or wired access to other devices, etc.
Its a whole $15... Clearly blow the bank on someone that has multiple devices, or a mac anything, etc
edit: No peter I wont, because its Gibberish..
"source of your WAN and have a LAN to do LAN to WAN for other devices""
Sorry but that is gibberish.. If you talking about having a device provide access to the network be it wired or wireless.. That is a switch, or a AP or router, etc.. Like the $15 one I just linked too.