You set up new events that handle low level stroke information or higher level strokes and chords. Multi-touch in Flash is possible; I was doing it three years

You set up new events that handle low level stroke information or higher level strokes and chords. Multi-touch in Flash is possible; I was doing it three years ago on custom hardware. In some cases games would certainly need to be altered to work with the new events, but the AS3 event system is robust enough that you can write apps that work on multi-touch and non-multi-touch hardware.