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You need to investigate the flash drawing API but this is far from a simple idea and the code would be far to complex to post here (assuming someone had the time or inclination to write it for you)
My advice is to get someone not new to flash to give you a quote and get it done profesionally, do not even think about taking this on yourself.
The drawing is not so hard. Currently i am thinking of storing all actions in a text array and post the text to the server and let php handle it width gdlib to recreate the pic on the server.
But my question is, is there anybody who knows if it is possible to "save" a userscreen and send it. because if some guru can tell i am wasting my time searhing for it i can step to the php/gd option i have thought of.