Multiple connections for one NIC

Is there some what to create multiple networking connections from one networking device?
I have my router secured, but I don't want to have to go through the hassel of re-entering the IP, gateway, DNS, ect. each time I come back from a LAN.
Oh, and I'm running Win XP Pro

>>2
Ok, I guess I didn't exactly explain well enough, so thats my fault, sorry.
What I ment was with encryptions.
I'd like to have my home wireless encryted, but I don't want to have to set it back up every time I leave and return from a LAN, or use some wireless access point.