Learn more about Apple ID. If you use a different Apple ID for iTunes and iCloud, and want to restore from a backup, first enter your Apple ID for iCloud. After your device restarts, you'll be asked to enter the Apple ID that you use with the iTunes Store, App Store, or iBooks Store.
File system repository. The file system repository allows access to files which have been uploaded (e.g. via FTP) into designated folders on the server. A file system repository may be available site wide for everyone or within an individual course (set up by admin) or for an individual administrator.
What a JAR file contains. Java applications and libraries can contain hundreds of different files, including compiled Java source code, a manifest file, XML-based configuration data, JSON-based data files, images, sound clips and even security certificates. A JAR file is simply an aggregation of all of these resources into a single, compressed file.