If you want to check the spelling of all the words in a buffer, type the command M-x ispell-buffer. This command scans the file, and makes a list of all the misspelled words. When it is done, it moves the cursor to the first word on the list, and acts like you just typed M-$ See section Checking a single word.
When you finish with one word, the cursor is automatically moved to the next. If you want to stop in the middle of the list type X or ^G.
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