The difference between views, viewports, forms, canvases, and windows is not
too clear in my mind and the Squeak online documentation does not make it
clearer. Could someone please enlighten me on the matter?

Would you use a view, a viewport, a form, a canvas, or a window, if you simply
wanted to draw a shape in a window (separate from the Workspace) using a Pen?

Many thanks.

Philippe de Rochambeau