The debugger is run out of a comint process buffer, or you can use a "track-mode" inside an existing shell.
To install you'll need a couple of other Emacs packages installed. See "the installation instructions":http://wiki.github.com/rocky/emacs-dbgr/how-to-install for details.
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+To get started using see the "notes on using emacs-dbgr":http://wiki.github.com/rocky/emacs-dbgr/how-to-use for details.