Canvas: "A gadget for drawing on using the feature rich BlitzPlus 2D graphics commands."
(A gadget being an "interfaceable" part of a window...)
i.e. it is the gadget you use to draw your game in BlitzPlus (especially in windowed mode). You can have more than one.
For example, you might create a window that is 640 x 480 pixels. If it has a title bar, menu bar, status bar, scroll bars, etc, they all take up some of that window's real estate, making the effective client area where you should draw your game smaller than 640 x 480. So you could create a canvas in that smaller area, and then reference it in its own coordinate space. (0,0 being the upper left corner of the canvas, instead of the 20,20 or something.)
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