Want to share an app with a family member without paying for another download? Apple allows you to do that simply and legally, as long as both computers are on the same network. This gets around the rather silly restriction of allowing an iPhone/iPod touch to only sync apps with one computer.
Home Sharing is an iTunes feature that Apple doesn’t make a lot of noise about, which is odd because it makes it simple to sync and transfer purchases between computers on the same network. Movies, TV shows, music, and yes, even apps can easily—and legally—be swapped between up to five computers, so if you’re in the living room and suddenly realize the song you want to hear is in the bedroom, or if you want to share an app with a family member who’s iPhone is synched to another computer, Home Sharing is the answer.
First, you need two computers on the same network with iTunes open. Then, if it’s not already active, go to Advanced > Turn on Home Sharing in the menu bar.
Now, enter your iTunes account name and password. You want to enter the same account on both computers—now this is different than authorizing a computer to play the old protected AAC music files.
After both of them have been signed up, you’ll see the Shared menu in iTunes’ sidebar.
From here, you can browse the audio, video, and apps on the other computer, but more importantly, you can now transfer the files. Just select the files you want and hit “Import.” Once the app is on the second computer, you can freely add it to any iPhone/iPod touch that syncs with that computer.
Even better, you can set up Home Sharing to automatically sync between the computers whenver they see each other, along with selecting what kind of file to look for.