> ## Documentation Index
> Fetch the complete documentation index at: https://docs.simular.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# LegacyOpen

# Function: legacyOpen()

> **legacyOpen**(`app`, `url`, `focusPolicy`, `visibility`): `void`

Defined in: [index.d.ts:1661](https://github.com/simular-ai/simulang-js-internal/blob/d2b85c3277cbb16ce50c0781e1db8ad2c8a5690e/index.d.ts#L1661)

Legacy helper used by Electron to open an app or URL.

## Parameters

### app

`string` | `null` | `undefined`

### url

`string` | `null` | `undefined`

### focusPolicy

[`FocusPolicy`](../enumerations/FocusPolicy.mdx)

### visibility

[`Visibility`](../enumerations/Visibility.mdx)

## Returns

`void`