Here is what I have used.
Phone line---->DSL Modem--->
--->Wireless router--------->Multiple port Hub
|--->Laptop 1 |--->Desktop 3
|--->Laptop 2 |--->Desktop 4
The Hub by itself does not work with more that one computer.
I have to have the router. I will let somebody else explain this.
In fact, I would not need the Hub, but I didn't want to string more cable through the trees. So just one cable comes out of the router and is split by the Hub. Because my internet speed is less that 1 Mega bit, the Hub does not slow down the connection.