# Set Multiview Window

| Message                       | Description                                   | Arguments |
| ----------------------------- | --------------------------------------------- | --------- |
| `/mixeffect/multiview/window` | Assigns a video source to a Multiview window. | Multiple  |

| Argument     | Type    | Description                                     |
| ------------ | ------- | ----------------------------------------------- |
| Window ID    | Integer | One-based index that is the window id.          |
| Source       | Integer | Video source id.                                |
| Multiview ID | Integer | One-based index of the Multiview. Default is 1. |

The sources available to the Multiview are greater than the other Video Source pickers. Look in Switcher Settings > Source Labels > All to see a list of possible values for your switcher.