Part III is about AppleScript in practice. The previous section described the AppleScript language; that is your sword. Now, wielding this sword, you will go forth to do battle; this section is about the battlethe practical side of actually using AppleScript to get something done.
The chapters are:
Chapter 20, Dictionaries
Chapter 21, Scripting Additions
Chapter 22, Speed
Chapter 23, Scriptable Applications
Chapter 24, Unscriptable Applications
Chapter 25, Unix
Chapter 26, Triggering Scripts Automatically
Chapter 27, Writing Applications