> ## 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

```typescript
legacyOpen(app: undefined | null | string, url: undefined | null | string, focusPolicy: FocusPolicy, visibility: Visibility): void
```

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

## Parameters

<ResponseField name={"app"} type={"undefined | null | string"} required />

<ResponseField name={"url"} type={"undefined | null | string"} required />

<ResponseField name={"focusPolicy"} type={"FocusPolicy"} required />

<ResponseField name={"visibility"} type={"Visibility"} required />