Imagine, what you have many texts. You can edit them and even not only you. Also you can add them into one big DB an even not only you. So, when one text imported in general DB then second time you may need to resolve conflicts. You also has general DB on other computer with other texts and you need to synchronize these two general DB. So, the question is "Is there SDK what can help me with this two synchronizations?". Thanks. Ups.. Objective-C.