From Dreamweaver / About linking and navigation
There are three types of link paths:
- Absolute paths (such as http://www.adobe.com/support/dreamweaver/contents.html).
- Document-relative paths (such as dreamweaver/contents.html).
- Site root–relative paths (such as /support/dreamweaver/contents.html).
The term "application root" would be the same as "site root" except that the site must be an application.