OSdata.com

Event Management

“An [Macintosh] application decides what to do from moment to moment by examining input from the user in the form of mouse and keyboard actions. It learns of such actions by repeatedly calling the Toolbox Event Manager (which in turn calls another, lower-level Event Manager in the Operating System). The Toolbox Event Manager also reports occurences within the application that may require a response, such as when a window that was overlapped becomes exposed and needs to be redrawn.” —Inside Macintosh, Volume I, page I-11^b4b

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