Get Started provides you with relatively high and helpful background information and explanation to help you start.

The administration gives you a detailed overview of PerformanceGuard's setup regarding the users, applications, and agents among many more.

I want to know...  guides you through the advanced steps involved in addressing fundamental problems and issues.

API & Tech Reference contains a technical reference for APIs and other aspects of PerformanceGuard. In addition, they describe how it works and how to use it.