[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'Forms' (#lcl)

# TApplication.OnHelp

Event handler signalled when help is requested in the application.

## Declaration

Source position: forms.pp line 1763

`public property TApplication.OnHelp : THelpEvent read FOnHelp write FOnHelp;`

## Description

OnHelp is a THelpEvent property with the event handler signalled (if assigned) when help is requested in the application. It is signalled from the DoOnHelp method when the ActiveForm does not have an assigned OnHelp event handler or does not respond the specified help command. It occurs before other application handlers using the ahtHelp handler type are notified.

## See also

TApplication.DoOnHelp |  | Signals an OnHelp event handler.
TApplication.HelpContext |  | Shows context-sensitive help for the application.
TApplication.HelpKeyword |  | Shows help for the specified keyword.
TApplicationHandlerType |  | Types of Application notification handlers.