Question : as3 function syntax

I have foudn this fuynction
public function isUp(keyCode:uint, ...keyCodes):Boolean

can someone explain me these arguments, espcially the
...keyCodes

Thanks

Answer : as3 function syntax

That's called rest parameter and I think this page sums up what it is...
   http://www.sephiroth.it/weblog/archives/2006/06/actionscript_3_rest_parameter.php

CyanBlue