Garbage Collection and External Function Calls

programming flash
1

I have a UI that is importing external SWFs. The external SWFs call functions in the main class like this:


import actionscript.Interface;

var directionsArr:Array = new Array();
directionsArr[0] = "Click the <b>Forward</b> arrow to continue.";

if (Interface._ui != null) {
    Interface._ui.setDirections(directionsArr[0]);
    Interface._ui.setBackNext(0,1); // Navigation buttons in UI
    Interface._ui.completePage(); // Shared Object is updated
}

How is garbage collection effected by this code? And is it creating a strong reference that is never garbage collected?