From Ant or command-line, how do I access an artifact file or link that has been published to Jazz Build Results?

Hi Folks,

This seems like an obvious quesiton but I haven't been able to find the answer:

The script run by Build Definition A produces artifact files and/or artifact links that are published to Build Results.  The script run by Build Definition B needs to access the artifacts published by a specific build of A.  How do I do this in a script?  That is, how do I get the list of A's builds, either by querying by build name/label or by tag pattern, and once I have selected the desired build of A, how do I access it's artifacts?