Sharing Files between WinXP and MAC OS 9

Ok I have a home network that has a 2 MACs and 2 PC’s. Both MACs are running MAC OS 9 and the PC’s are running windows XP and Windows 2000 Professional. I want to share files between these machins over my LAN. How do I set this up. I read somone mention that seting up file sharing betwwen XP and the MACs is easy. Share the knowlesdge please. Thanks