electron/docs/api/structures/ipc-renderer-event.md

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# IpcRendererEvent Object extends `Event`
* `sender` IpcRenderer - The `IpcRenderer` instance that emitted the event originally
* `senderId` Integer - The `webContents.id` that sent the message, you can call `event.sender.sendTo(event.senderId, ...)` to reply to the message, see [ipcRenderer.sendTo][ipc-renderer-sendto] for more information. This only applies to messages sent from a different renderer. Messages sent directly from the main process set `event.senderId` to `0`.
* `ports` MessagePort[] - A list of MessagePorts that were transferred with this message
[ipc-renderer-sendto]: ../ipc-renderer.md#ipcrenderersendtowebcontentsid-channel-args