Many visual cues are under the control of the application, such as the disabling (or graying out) of fields, menu items, and push buttons when their use is inappropriate. For example, the OK button should be disabled until all the mandatory fields on a window have been completed.
Menu items should be disabled to prevent the user performing actions that are out of sequence, not relevant to the current processing or for which the user is not authorized.
Menu options can also be disabled to advise the user that a particular action is currently inappropriate.
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