Portable Document Page
PDF is a file format that preserves all of the fonts, formatting, colors, and graphics of any source document, regardless of the application and platform used to create it. http://www.adobe.com/products/acrobat/adobepdf.html
To download Adobe Acrobat Reader (which includes the PDFViewer plug-in for your web browser) go to http://www.adobe.com/products/acrobat/readstep.html
Edit your browser preferences so that MIME type application/pdf points to the PDF Viewer.