Minimalist Cocoa programming

In this post, I build and run a Cocoa Mac application on the command-line. This might not sound like a very difficult goal but I'll attempt to follow an additional constraint: use as few tools, components, classes and even lines of code as possible; truly minimalist Cocoa programming. The goal is to create an application that qualifies as a proper Mac application (including a menubar and a window) but without using Xcode, without an Info.plist file, without NIB files, without Interface Builder and without even using a text editor other than the Terminal itself.