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    <p>Yes, it's possible. Here is an example: <a href="https://github.com/krevis/RemoteLayerDemo" rel="noreferrer">https://github.com/krevis/RemoteLayerDemo</a></p> <p>Run the app, press the "Get Remote Layer" button, and the service will be started and will give the app a green remote layer. (Oddly, it takes several seconds to appear -- no idea why.)</p> <p>After that, the "Change Color" button sends a message to the service asking it to change the layer's color, which takes effect immediately, and even animates. The "Remove Remote Layer" button removes the layer; the service will then get terminated if you let it idle for a few seconds.</p> <p>The hard part is passing the Mach port of the <code>CARemoteLayerServer</code> between processes. The <code>mach_port_t</code> that you see in your process is just a number; it only has meaning within your process. (Same idea as a pointer: pointers are just numbers, but you can't pass a pointer from one process to another, and expect them to point to the same thing.)</p> <p>You'd think XPC could send Mach ports, but it can't. It would make this a lot easier!</p> <p>Instead, you have to use Mach API to send the underlying Mach port around. In the demo, I'm using <code>bootstrap_register</code> in the app and and <code>bootstrap_look_up</code> in the service, using an agreed-upon name. This is not secure, because any other app in the same bootstrap context could find the port, but it's good enough for a demo. In reality you'd want to <a href="http://fdiv.net/2011/01/14/machportt-inter-process-communication" rel="noreferrer">dive down to some uglier Mach calls</a>.</p>
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    1. POCan CARemoteLayerServer and CARemoteLayerClient be used between processes?
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    1. USKurt Revis
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    1. COMany thanks, particularly for the working demo, totally awesome. I was making a bad assumption about mach ports working like socket ports (which you can pass around). Clearly I need to spend more time with the Internals book!
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