Touch screen + flash discussion

Hi everyone,

I have been looking at development proposals for touchscreen using flash and would like to open a discussion in regards to actionscript and touchscreen. I’m still confuse about approaching the devlopment of touchscreen with backend.

I know touch screen is similar to developing a website, however your finger is your mouse.

My discussion topic is:
If I have 5 touch screen system located in different physical locations, connected to one central point to update information. Waht would be the best way to communicate to flash on each touch screens?

I know xml would be best for flash and say use php as middle ware, but thats my vaig understanding. Dose anyone have other better solution?