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user:1234 user:me (yours) |
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A callback is typically the address of a function or method or lambda expression provided when invoking an API. When an action completes, the expression is executed or "called back". Asynchronous APIs use callbacks to notify the calling function when an operation is complete. Use this tag for questions involving asynchronous APIs requiring a call back expression. Use the tag event-handling for questions on registering or subscribing for events, e.g. GUI.