Send your nephew the latest combat adventure game. Or your best friend that album you have on repeat. Just find the music, movies, TV shows, apps, or games you want to give on the iTunes Store or App Store. From your computer, click the arrow next to the price and choose “Gift this.” Or from your iOS device, tap the share button at the top of the screen.* We’ll send an email letting your recipient know about it. With one click, your gift will start downloading to their device.
I went to my iTunes Store on my Mac's iTunes, which knows I have it downloaded. No price is listed because of that, and the down arrow doesn't have "give as a gift" available.
I found instructions for copying an app to a flash drive then going to their computers and copying them to iTunes - then authorizing their computers to use my app. But I wonder what happens when the app is upgraded - I'm not telling them my password!!!