# alt

> Is Alt/Option key held down? (Read Only)

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.UICommonModule

```csharp
public bool alt { get; set; }
```

### Remarks

On Windows, this returns true if any Alt key is held down.

On Mac, this returns true if any Option key is held down.

### Examples

```csharp
using UnityEngine;

public class Example : MonoBehaviour
{
    // Prints Option or Alt key was pressed depending on the
    // platform where this script is running.
    void OnGUI()
    {
        Event e = Event.current;
        if (e.alt)
        {
            if (Application.platform == RuntimePlatform.OSXEditor)
            {
                Debug.Log("Option key was pressed");
            }
            else if (Application.platform == RuntimePlatform.WindowsEditor)
            {
                Debug.Log("Alt Key was pressed!");
            }
        }
    }
}
```