<!--
{
  "availability" : [
    "macOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "AppKit",
  "identifier" : "/documentation/AppKit/NSApplication/showHelp(_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "AppKit"
    ],
    "preciseIdentifier" : "c:objc(cs)NSApplication(im)showHelp:"
  },
  "title" : "showHelp(_:)"
}
-->

# showHelp(_:)

If your project is properly registered, and the necessary keys have been set in the property list, this method launches Help Viewer and displays the first page of your app’s help book.

```
func showHelp(_ sender: Any?)
```

## Parameters

`sender`

The object that sent the command.

## Discussion

For information on how to set up your project to take advantage of having Help Viewer display your help book, see [Specifying the Comprehensive Help File](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/OnlineHelp/Tasks/SpecifyHelpFile.html#//apple_ref/doc/uid/20000020).

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)