The usual answer for this is to pass a Context object to the add
method of bulkloader, as explained here:
http://groups.google.com/group/bulkloader-users/msg/04574ec78c4458ba
On the lazy loader class you can use a <context> node such as:
<file>
<url>somefile.swf</url>
<context>sameDomain</context>
</file>
If all you want is to retrieve the ApplicationDomain for a swf you've
already loaded, then it's just the regular player api:
var myMovie : MovieClip = loader.getMoveClip("somemovie.swf");
var appSomain : ApplicationDomain = myMovie.loaderInfo.applicationDomain;
Cheers
Arthur Debert