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I am only guessing here but I would say..............

it's all down to history..................

when you open a file and look at your history layers (breath mark) there you will find a layer that says open file.......... could this be it?

if you are to turn the image 90 degrees ............ look again at your history layers (breath again mark he he he) there you will find your action which you can undo

so my guess is that it stores it in memory or history so that it can be undone.

sfm