gateway?
 

As a less than newbie, I ask:
I am working toward setting up a small office network. server on a dsl line, office computer and connetion for laptop. Can I set the server as a dialup gateway for access to internet from home?

dial-up server
 

short answer: yes

long answer: start reading howtos and docs ( on www.linux.org or www.linuxdoc.org or search google.com) ; look at things like ppp, routing, firewalling and dhcp. maybe even vpn