These are the general ways two PCs use one DSL connection.
1. This DSL modem is also a router with wireless.
2. Or, a router is installed alter the DSL modem.
3. A tireless device is installed on the PC and "bridged."
My favorite is #1. Cost me $80, but it eliminated all the hassle.
Number 2 is fair, but some routers are have a fussy setup.
Number 3 is the cheap way. If you already have two wireless things.
But trying to understand how to do the bridge takes over a day.
Unless you follow instructions, which is emotionally difficult for me!