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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.

QAssistantClient | Means of using Qt Assistant as an application's help tool
QHelpEvent | Event that is used to request helpful information about a particular point in a widget
QStatusBar | Horizontal bar suitable for presenting status information
QStatusTipEvent | Event that is used to show messages in a status bar
QToolTip | Tool tips (balloon help) for any widget
QWhatsThis | Simple description of any widget, i.e. answering the question "What's This?"
QWhatsThisClickedEvent | Event that can be used to handle hyperlinks in a "What's This?" text