App developers don't blindly release software to Apple's App Store. They run private beta tests. These testing programs are based on unique identifiers -- known as UDIDs -- that developers associate with their Apple dev accounts. The UDIDs allow for apps to be released to specific iOS devices.
On the user side, you'll need to dig up your device's UDID to participate in a beta. Uncovering the ID is a simple process, but it's not particularly obvious. Here are the steps:
1. Open iTunes
2. Click on your iOS device in the left pane.
3. Make sure the Summary tab is selected.
4. Hover your mouse over the "Serial Number." Click once. The serial number will change to "Identifier (UDID)" and reveal a long string of numbers and letters.
5. You can't highlight the UDID string, but you can still copy it to you clipboard by pressing command-c on a Mac or control-c on a PC.
Send the UDID to the developer and soon you'll be testing away.
- How to Prepare an iPhone App for Ad Hoc Distribution
- How to Generate and Install iPhone Developer Certificates and Profiles
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