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Excercise 7 - Adding instance variables to an object
Hit the "add inst var" button in a scriptor to add an instance variable. The new instance variable starts out bearing a number, but you can change its type at any time. The type affects what form its readout (in the Viewer) will take, and also where in a scriptor you can drop a tile representing the value (numbers can be dropped on numbers, etc.)
If the type is a number, for example, you'll get a textual readout with arrows to change the values manually. But if the type is "player" (i.e. object-reference, or "alias", if you will), then the readout is a graphical thumbnail of the current referent.
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