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In Emacs, undo means undoing changes to buffers. However, this page includes discussion of related ways to “undo” other aspects of your Emacs session.

Undo Replacements:

Undo Utilities:

Besides changes to buffers, you can undo some other changes to your current Emacs state. In most cases, this undoing really means cycling or popping recorded states.

Frame Configurations:

Locations in buffers: