Apple has long offered a laptop option when you want to use just an external display in mirrored mode and not view the internal monitor. You can close the clamshell lid, and your separate screen continues to work. But what if you want to have external devices active and don’t need a display? One reader, for instance, wants to keep a webcam active but close their laptop’s lid. Apple doesn’t provide a “headless’ option, and I can’t find third-party
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