Full text of papers, as well as some other documents such as class notes are primarily available primary in Adobe Systems portable document format (pdf). In order to view and print documents in this format, you will need to obtain a free viewer for your platform from Adobe. Currently all varieties of Windows, the Macintosh and a variety of Unix systems including Sun are supported. There is even a DOS version. Depending on your platform, you may be able to configure your web browser to automatically load the pdf viewer when you click on a document in the pdf format.