The "Heading Cluster" of buttons enable an end user to switch between four list types, and to Logoff.

The Bucket List, the Keyword List, the Items List, and the Filters List. Each list type reveals associated text in the List.

The Bucket List contains Bucket Names, in capital letters, which when clicked on are set such that subsequent buttons pressed will reference the activated bucket name.

The Keyword List contains Keywords, in lower-case letters, which when clicked on are set such that subsequent buttons pressed will reference the activated keyword name.

The Items List contains a List of items which will correspond to the active Bucket Setting, the active Keyword Setting, and the active Content Type setting.

The Filters List contains filter words, that when toggled, are used to find PDF's containing specific filter words.