Check the listing for details. Puppy Linux OS - Runs Smooth - Small Footprint - Loads in Memory - LIVE DVD. Condition: Brand New. Listed at 19.99 USD. By default, Puppy uses single click mouse action, kind of like web pages, single left click on a folder/directory to open it, single left click on a file to open it. Unlike Windows or large Linux distributions that install thousands of individual files on your drive, Puppy puts only a few compressed files that are like “Zip” files in Windows (this method is called a “Frugal” install for the efficient way it uses the computers resources). When Puppy boots up, the contents of these files are copied into RAM memory and Puppy runs completely from ram. The original compressed files are “read only” so they always remain in like new condition. This goes a long way into making Puppy more stable, secure and bullet proof than other operating systems.