Methodology of the TrackyMemo for iCloud App

• The iCloud technology is used for data sharing and synchronization among multiple devices under the same AppleID.
• The App stores the memos in iCloud.
• The App stores metadata of the memos in iCloud. The metadata includes, creator device, creation time and identities of viewers.
• The App deploys the notification center of iCloud. As a result, changes made to iCloud would notify the App. And the App would then update the memo information.
• When a device views a memo created by another device, the memo's viewer metadata would be updated. Therefore the users can track who have viewed their messages.
• When a new memo is created, the other users would be notified because the App knows that the users have not read the memo.