4.  Callback Functions  

(add-callbacks widget callback-name . callback-functions)

See XtAddCallbacks. Adds the functions to a callback list of the specified widget. callback-name is a string or a symbol. Each callback function will be called with at least one argument - the widget to which the function has been attached.

(add-callback widget callback-name callback-function)

Calls add-callbacks with the specified function.

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