How to access a query string in flash??

Here is a solution

var str:String = "http://www.gtcbio.com/conferenceDetails.aspx?id=123";
var results:Array = str.split('?');

trace(results[1]);

Here is a solution-

var str:String = "http://www.gtcbio.com/conferenceDetails.aspx?id=123";
var results:Array = str.split(?);

lo que buscas quedar��a en results[1];

So what was the solution to grab the query strings from Flash?

If this is a string value presented to Flash you can use the String.split() method to isolate the query portions of it.  Just use the question mark as the delimiter.