advertised-undoadvertised-undo is an alias for `undo' in `
simple.el'. (advertised-undo &optional ARG) This function is obsolete since 23.2; use `undo' instead. Undo some previous changes. Repeat this command to undo more changes. A numeric ARG serves as a repeat count. In Transient Mark mode when the mark is active, only undo changes within the current region. Similarly, when not in Transient Mark mode, just C-u as an argument limits undo to changes within the current region.