IT. Expert System.

A confirmation that settings or an action is acceptable. For example, many windows that display a series of settings or other information have an Ok button, when this button is pressed any settings or options in that window will be saved or if the window displays no settings the Ok confirms the user read the message in the dialog box. In the below example, is an error message in Windows with an OK button. In this example, the OK confirms that the user has read the error message.

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