Files in Portable Document Format (PDF) are viewed with Adobe Acrobat Reader. Adobe has FREE Acrobat Reader software available to download for DOS, Windows, Macintosh, Sun SPARC, HP, Silicon Graphics, and AIX systems.
You will need to change the settings on your computer so that Acrobat Reader is an external viewer or "Helper Application."
Go to the heading "Helper Applications" and choose the instructions that match your computer and browser (i.e., Netscape for Macintosh, Netscape for Windows).
and LLNL Disclaimers