Did you read the documentation reference for NSWindow?

NSWindowDidChangeScreenNotification
Posted whenever a portion of an NSWindow object's frame moves onto or off of a 
screen.

NSWindowDidChangeScreenProfileNotification
Posted whenever the display profile for the screen containing the window 
changes.

Beware that those notifications are effective on 10.4 only.

EG

> Is there a callback available when the display profile is changed by
> the user or programmatically? Also, is there a calllabck available
> when the user drags a window between different screens?

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