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 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