The Site Window
With the Site window you will 
  see all the files in your site as well as assets, etc. This is great for quick 
  editing. 
  
  You set up a folder for you website on your local machine. This contains all the 
  assets for your site. You will point to this Site folder and create a named local 
  site with all your files in it for Dreamweaver to keep track of things. 
  
you can have many local sites on one machine set up in Dreamweaver
Dreamweaver caches all the files in your site to modify them easily. It 
  will warn you of broken links, etc.
To open: Window>Files
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