These classes provide for all forms of online-help in your application, with three levels of detail:
| QAssistantClient | The QAssistantClient class provides a means of using Qt Assistant as an application's help tool. |
| QHelpEvent | The QHelpEvent class provides an event that is used to request helpful information about a particular point in a widget. |
| QStatusBar | The QStatusBar class provides a horizontal bar suitable for presenting status information. |
| QStatusTipEvent | The QStatusTipEvent class provides an event that is used to show messages in a status bar. |
| QToolTip | The QToolTip class provides tooltips (balloon help) for any widget. |
| QWhatsThis | The QWhatsThis class provides a simple description of any widget, i.e. answering the question "What's This?". |
| QWhatsThisClickedEvent | The QWhatsThisClickedEvent class provides an event that can be used to handle hyperlinks in a "What's This?" text. |