RIA Checkpoint defaults to it's Search Screen. On the panel on the left you can choose your area of practice. The main search screen is divided into the following libraries: Editorial Materials, Primary Source Materials, News/Current Awareness and Archives. Each library is subdivided into individual sections. To search you will need to put a check in the check-box associated with the library or section you wish to search.
You can browse the contents of RIA Checkpoing by clicking the Table of Contents link on the top menu.