Q: How can I run ispell inside emacs?

Answer

If you are unfamiliar with ispell, please see How can I spell check a file or document?.

You can run ispell inside an Emacs buffer with the command:

M-x ispell

Now the following commands are available for the duration of your emacs session:

M-x ispell-word - Checks word
M-x ispell-buffer - Checks buffer (current file)
M-x ispell-region - Checks region

ispell functions normally inside Emacs, although it uses the minibuffer for commands.