Notes from a 1984 trip to Xerox PARC
Wow, this is really deep:<p>&gt;One philosophical point is that each window is of a type: a browser, a debugger, a workspace, a bit editor. Each window is created by a special action that determines its type. This is in contrast to our style of windows, which creates a general space in which anything may be run. With our windows, it is easy to get to the outside world; the notion of Unix appears only when a Unix thing happens in the window. By contrast, Smalltalk windows are always related to Smalltalk. This is hard to explain (it is, as I said, philosophical), but a trite explanation might be that you look outwards through our windows but inwards through theirs.