This guide is divided into a number of sections:

Introduction
Covers installing SEGGER Embedded Studio on your machine and verifying that it operates correctly, followed by a brief guide to the operation of the SEGGER Embedded Studio integrated development environment, debugger, and other software supplied in the product.
SEGGER Embedded Studio User Guide
Contains information on how to use the SEGGER Embedded Studio development environment to manage your projects, build, and debug your applications.
hcc
Contains documentation for the C compiler, including syntax and usage details and a description of extensions provided by SEGGER Embedded Studio.
has
Contains detailed documentation covering how to use the assembler, the assembler notation, macros, and other assembler features.