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# Help System

These classes provide for all forms of online-help in your application, with three levels of detail:

1. Tool Tips and Status Bar message - flyweight help, extremely brief, entirely integrated in the user interface, requiring little or no user interaction to invoke.
2. What's This? - lightweight, but can be a three-paragraph explanation.
3. Online Help - can encompass any amount of information, but is typically slower to call up, somewhat separated from the user's work, and often users feel that using online help is a digression from their real task.

QStatusBar | Horizontal bar suitable for presenting status information
QToolTip | Tool tips (balloon help) for any widget
QWhatsThis | Simple description of any widget, i.e. answering the question "What's this?"
QWhatsThisAction | Ready-made action to invoke "What's This" context help