title: How to differentiate two ipc renderer in one ipc main (same channel)
body: <p>I want to detect the specific frame/browserWindow. I have one main process and two browser windows which all three are sending message to each other using same channel . in IPCMain I need to detect one of them. I saw that IPCmain event has a function named frameId but when I use it I get undefined.</p>
  
  <pre><code>ipcMain.once("postMessage", (event, message) =&gt; {
      if(!activeRequest) return;
      activeRequest.json(message).send();
  });
  </code></pre>