Custom Loop to replace mp_list_global_products()

For better flexibility I want to make my own custom looped list of global products to replace using the mp_list_global_products() function.

I've started with the obligatory:

'<?php query_posts(array('post_type'=>'product')); ?>'

But this only brings back products from the local store. How do I get the global list?

Also, any general advice on how to achieve this would be great.