Emacs packages: broadcast

The package broadcast allows you to simultaneous edit buffers.

Installlation

I prefer to use use-package.

(use-package broadcast
  :ensure t
  :commands broadcast-mode)

Usage

Enable broadcast mode on all buffers you want to edit simultaneous (M-x broadcast-mode). This links the buffers together, so that every command issued in one of them, will be replicated to the others. Affects only visible buffers.