(a) I don't think you can call two functions directly from one event listener (I'm a noob, so I could be wrong) but you can definitely do this:
Code:
addEventListener(Event.SOME_KIND_OF_EVENT, masterFunction);
masterFunction():void
{
// all this function does is call two other functions
doFunction1();
doFunction2();
}
function doFunction1():void
{
}
function doFunction2():void
{
}
So, yes, you can definitely call one function from within another.
Not sure if that's what you mean by 'nesting'?