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Originally, IB was the IDE, but you edited your code using TextEdit (which had a programmer's mode) or Emacs or VI. Later (1995?) they added Project Builder as
by thought_alarm 16y ago
Originally, IB was the IDE, but you edited your code using TextEdit (which had a programmer's mode) or Emacs or VI. Later (1995?) they added Project Builder as a more traditional IDE (class and method browsing, code completion, integrated debugger, etc.)
Project Builder had 3 windows: a single window for managing the project and editing source code, one window for the debugger, and one window for compilation. This is the "Default" layout in XCode. XCode also has "Condensed" layout, in which the project and source code windows are separate, and "All-In-One" layout, in which project, source, debug, and build modes are contained within a single window.