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In the Quick Start chapter, you received a very quick introduction to AppleScript Editor. In this section, I'll slow down a bit and give you a much closer look. It's worth taking the time to learn something about this tool, as you'll be spending most (if not all) of your AppleScripting time here. Yes, it is possible to create and maintain AppleScripts with TextEdit (or other text-editing tools), and yes, there are other Integrated Development Environments (IDEs) available that do a fine job, but for the most part, AppleScript Editor is all that you need.
Please note that in Leopard, the AppleScript Editor was called Script Editor. It was renamed in Snow Leopard and moved under Applications Utilities.