Manual
The manual that accompanies Game Maker is a document that has information on all the built-in functions and variables available in Game Maker, with the exception of action functions (the direct GML equivalents to drag-and-drop actions), and deprecated variables and functions left in for backward compatibility, such as image_scale, which has been succeeded by image_xscale and image_yscale.
A notable example of a deprecated variable is image_single, which when changed to a sprite's subimage, will set image_speed to zero automatically, as well as setting image_index to the value image_single is set to.
Read more about this topic: Game Maker Language
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