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# CGEventTapLocation

Constants that specify possible tapping points for events.

```
enum CGEventTapLocation
```

## Overview

In addition to the three tapping points described above, an event tap may also be placed where annotated events are delivered to a specific application. For more information, see the function [`tapCreateForPSN(processSerialNumber:place:options:eventsOfInterest:callback:userInfo:)`](/documentation/CoreGraphics/CGEvent/tapCreateForPSN(processSerialNumber:place:options:eventsOfInterest:callback:userInfo:)).

## Topics

### Constants

[`CGEventTapLocation.cghidEventTap`](/documentation/CoreGraphics/CGEventTapLocation/cghidEventTap)

Specifies that an event tap is placed at the point where HID system events enter the window server.

[`CGEventTapLocation.cgSessionEventTap`](/documentation/CoreGraphics/CGEventTapLocation/cgSessionEventTap)

Specifies that an event tap is placed at the point where HID system and remote control events enter a login session.

[`CGEventTapLocation.cgAnnotatedSessionEventTap`](/documentation/CoreGraphics/CGEventTapLocation/cgAnnotatedSessionEventTap)

Specifies that an event tap is placed at the point where session events have been annotated to flow to an application.


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