AirDrop uses Bonjour, the technology that lets Macs and other devices on a network announce their presence and the services they provide, so other computers and devices on that network can find them without a lot of tedious configuration on your part. There’s an interesting reason this switch works. (You can reverse the process by using the same command with 0 instead of 1, and relaunching the Finder again.) When the Finder finishes its restart, you should see an AirDrop entry in the Finder sidebar that wasn’t there before. Select Relaunch from the contextual menu relaunching the Finder activates the code you entered above. Hit Return, then go back to your Desktop and hold down the Option key as you Control-click (or right-click) on the Finder icon in the Dock.
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