Originally Posted by WillyPete

Use a crossover cable.
It eliminates needing the hub/switch.

If you want to access internet thru A you need to turn on internet sharing on A.
To control B, the easiest way is using XP's built in Remote Desktop Connection found in Accessories in your menu.
You need to right click the My Computer icon on B and enable remote desktop in the Remote tab.

As A has wireless, you won't need to add another network to access the outside world.

A cleaner way would be to move just the pc case without monitor or k'board to an area near the wireless router and plug B into the router with a std network cable if the router has network ports too. It will lighten the load on A if you can do this as B can then access the web directly thru the router.

Best way to share B for storage is to Create a shared folder.