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GML Does an object contain a constant and unique variable?


For example, I am building a game with puzzles, and I need to save the states of each button. Is there a built in property to objects that is unique and will always be the same no matter how many times I close and restart the game, or will I have to give each one a unique number in creation code?


Instances placed in the room using the IDE will have a constant id for the first room (I think). Then even if you go back and forth between rooms, those ids will remain.

Instances created in the IDE also have a built-in constant, but dunno how you save via that constant.

Instances added via code have nothing constant about them.