Check out these pages in the documentation:
1. Getting Files API Overview
http://www-10.lotus.com/ldd/lcwiki.nsf/dx/Getting_Files_feeds_ic301
2. Getting the current user's files
http://www-10.lotus.com/ldd/lcwiki.nsf/dx/Getting_a_feed_of_your_library_ic301
3. Getting public and shared with files
http://www-10.lotus.com/ldd/lcwiki.nsf/dx/Getting_a_feed_of_a_persons_library_ic301
I think what you're looking for is access to the current user's files, in which case link 2 from above will do. For example, call:
<server>/files/basic/api/myuserlibrary/feed
to get an ATOM XML feed of all the files for the current user.