How to get two different apps to read from the same shared object

I had a question regarding using the shared objects across 2 apps on iphone.
I understand that using 
var so:SharedObject = SharedObject.getLocal("myApp", "/");
will enable 2 different swfs to read from the same shared object

This works when I test on PC but it is not working when I try using it with 2 apps on iphone.
Any solution ?