Using Adobe Acrobat Reader
The hand tool allows you move the page around on the screen
To the right of that the zoom tool lets you zoom in and out on the document
The inner two arrows allow you to go to the next page or back a page.
The outer arrows allow you to go to the first and last page.
Displays the page as 100%. The right two buttons give you the option
to fit the page within the window or fit the page's width within the window.
Other Links
http://www.c3i.osd.mil/org/cio/i3/AWG_Digital_Library/tutorial/tutorial.pdf
http://w3.aces.uiuc.edu/AIM/scale/tutorials/Acrobat/
All of the publications are in Adobe .pdf format.
To download Acrobat Reader, click the image.