Online Multiplayer Flash Game [?]

Hey do any of you know how I can create a simple multiplayer game in flash? I want it to be accessible to people from the net so they can play with each other. do any of you know useful tutorials or programs I need? I already have Flash MX. thx in advance. :beer:

PS I’m aiming at something like SnowCraft ( http://www.nny.com/holiday/snowcraft.htm ) but online.