electron/docs/fiddles/communication/two-processes/asynchronous-messages/index.html

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div>
<div>
<h1>Asynchronous messages</h1>
<i>Supports: Win, macOS, Linux <span>|</span> Process: Both</i>
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<div>
<button id="async-msg">Ping</button>
<span id="async-reply"></span>
</div>
<p>Using <code>ipc</code> to send messages between processes asynchronously is the preferred method since it will return when finished without blocking other operations in the same process.</p>
<p>This example sends a "ping" from this process (renderer) to the main process. The main process then replies with "pong".</p>
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<script>
// You can also require other files to run in this process
require('./renderer.js')
</script>
</body>
</html>