в последнем кадре первой swf:

Код:
var sending_lc:LocalConnection = new LocalConnection();
sending_lc.send("lc_play", "methodToExecute", 1);
в первом кадре второй swf:

Код:
stop();
var receiving_lc:LocalConnection = new LocalConnection();
receiving_lc.methodToExecute = function(param1:Number) {
if (param1 == 1){
play();
};
};
receiving_lc.connect("lc_play");