How to check contents of folder?

Hi There,

I'm wanting to be able to look at a folder through the API and find out what items are contained within the folder. Is that possible?

The ultimate goal is to be able to automatically close folders where all items contained within are done. I can do this in the reverse, brute-force method by finding a folder id and then parsing all items for the folder parent but that seems quite wasteful.

Thanks,
Joe.