By typing in search words one letter at a time on their device, the user can refine selections in the index until the find the necessary topic. Each division is further broken down into subcategories, each addressing a specific area of medicine. The entire text is hyperlinked so that you can jump to topics within the text that you are reading. The list is narrowed to words starting with those 3 letters. From there you can scroll down to Pneumonia, which also contains several specific sub-topics.
Hyperlinked words exist within the text describing treatments.
Most topics also contain links to related topics. For example, tapping the related topics for 'Pneumonia' links you to the section on 'Pulmonary Disorders'. Links to the 'Table of Contents' and 'Index' also remain on the top of each page for quick access. While this interface may sound cumbersome and too text-rich for a PDA, I found the opposite to be true. A Pocket PC version exists on the same CD as the Handheld PC version, and all sections are very readable on the Pocket PC sized screen.