the Emacs interface to the GDB debugger.
"Graphical front ends are available for GDB, including Insight, but they require a separate editor. Until now, Emacs used a mode that originally was written by Eric Raymond in 1992. This comprised of the GUD buffer, where GDB commands were entered as though on the command line, and the source buffer, where a arrow string ("=>") pointed to the current line of program execution. In this article, I describe a new mode, which I call GDB-UI, that is a part of the next release of Emacs (21.4) and offers the GUI features of many modern debuggers. The advantage of this mode over the other debuggers is the powerful features of Emacs are available for tasks such as editing and searching to provide a truly integrated development environment.
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