The following piece of script monitors the order in which 3 buttons are pressed. Depending on the result an event can be triggered.

myArray = new Array();
a.onPress = function() {
	i = "a";
	myArray.push(i);
};
b.onPress = function() {
	i = "b";
	myArray.push(i);
};
c.onPress = function() {
	i = "c";
	myArray.push(i);
};
_root.onEnterFrame = function() {
	trace(myArray);
	if(myArray[0]=="a" && myArray[1]=="b" && myArray[2]=="c"){
	       trace("done");
	       delete _root.onEnterFrame;
	} else if (myArray[0]!="a" && myArray.length==3){
	       trace("failure");
	}
};