Hey Markp.com,

Multiplayer games is a very advanced step for flash designers, and will require more than a tutorial, to learn. I would encourage you to team up with a seasoned server-side programmer. You will find that most experienced php,cgi,asp programmers can quickly help you develop a multiplayer flash game, allowing you to focus on what you do best FLASH.

Best Luck, maybe oneday i'll convince fragged (my server-side programmer) to write a tutorial.