Home Network woes

Hi
I’m sure someone knows how so here goes:
I have three laptops on a wireless network and one of them, which I shall call the primary, running XP SP2 and has a USB printer (HP 2610) and a USB external hard drive attached via a powered hub. What I need to know is: how can I access the printer and the hard drive from the other two PCs which run Vista?
A step by step would be greatly appreciated.
I manged to secure my WiFi OK via MAC address filtering and WEP encryption but accessing the printer and hard drive has me beat. 🙂
Regards Allan.