PhoneAble is a freeware program for windows dedicated to backup your iPhone library key, and change your iTunes key to exactly match the iPhone library key, then you could copy any song from any computer to your iPhone!
Normally an iPhone is associated with just one iTunes library, and you can only manage your music with that one copy of iTunes. PhoneAble takes your iPhone library key and applies it to any number of other iTunes installations, allowing you to manage your music on whatever computer you happen to be at. It’s pretty easy to use.
* Created coloured UI for the steps.
* Created code to read/write the iTunes library key.
* Created code to read the iPhone library key from a backup.
* All strings are translatable.