ActionScript 3.0 :: Keyboard Listener For String Of Characters

I have a flash app that I would like to listen for a string of characters being typed on a keyboard. If a user typed in apple as an example that would either be correct or incorrect, and if they typed it in uppercase or lowercase or upper and lower it would still equate to true. Here is the tricky part, the string is not being typed into a textfield or anything like that, it must just be typed and after flash sees the correct keys pressed in the correct sequence it will fire a function.

I have seen this done before in a situation where a website had a background administration application, and when browsing the site you could just type admin, and a window would pop up asking for a username and password, so that is almost exactly what I want. Because of this I figured I would try to replicate the admin application first as it should be simpler

This is what I have thus far
stage.addEventListener(KeyboardEvent.KEY_DOWN, keysPressed);
var keyCatcher:Array=new Array(); var keyCatchNew:String;
function keysPressed(e:KeyboardEvent):void{
if(e.charCode==65 || e.charCode==68 || e.charCode==77 || e.charCode==73 || e.charCode==78 || e.charCode==97 || e.charCode==100 || e.charCode==109 || e.charCode==105 || e.charCode==110){
keyCatcher.push(String.fromCharCode(e.charCode));
[Code] .....