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# FxModifierKeys

Specifies flags that identify modifier keys held down while an event is generated.

```
typealias FxModifierKeys = Int
```

## Topics

### Constants

[`var kFxModifierKey_SHIFT: Int`](/documentation/professional_video_applications/kFxModifierKey_SHIFT)

Specifies the left or right Shift key.

[`var kFxModifierKey_CONTROL: Int`](/documentation/professional_video_applications/kFxModifierKey_CONTROL)

Specifies the left or right Control key.

[`var kFxModifierKey_OPTION: Int`](/documentation/professional_video_applications/kFxModifierKey_OPTION)

Specifies the left or right Option key.

[`var kFxModifierKey_COMMAND: Int`](/documentation/professional_video_applications/kFxModifierKey_COMMAND)

Specifies the Command key.

[`var kFxModifierKey_CAPS_LOCK: Int`](/documentation/professional_video_applications/kFxModifierKey_CAPS_LOCK)

Specifies the Caps-Lock.


---

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