How to Connect Macs Wirelessly Using AirDrop
If two or more Macs, running Mountain Lion or Mavericks, are connected to Wi-Fi, and are reasonably close to one another, you can share files among the machines, even if they’re not on the same Wi-Fi network. No special setups or passwords are required, either, though all the machines must have the AirDrop feature — the feature that makes all this possible — turned on.
The simplest way to do that is to click AirDrop in the Finder Sidebar. Alternatively, press Shift+cmd+R or choose Go→AirDrop. (Keep in mind that both computers should have Air Drop open.)
Then it’s just a matter of dragging the file you want to share onto the picture of the person representing the other computer. You can share text documents, pictures, entire folders, snippets of highlighted text, URLs, audio files, and more.
Apple makes sure that you really want to share the file in question when you drag it over to the picture, and the person at the other end must willingly accept the file. Couldn’t be much simpler than that.
Close the Finder window when you no longer want your Mac to be visible to other nearby Macs.