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9.2 How do I perform spell checks?

Emacs has support for spell checking on demand (ispell) and as your type (flyspell). Both packages depend on a copy of ispell 3.2 or a compatible spell-checking program. GNU Aspell is a popular choice these days, Windows installers are available from the official site.

Once installed, you will need to configure ispell-program-name to tell ispell and flyspell to use aspell as a replacement for ispell. You can include the full path to the aspell binary, which means you do not need to add its installation directory to the PATH.