As application has no immediate access to the data, the information is being copied in some buffer on the user's side. A mismatch of the real information with the one being used by the user occurs during the modification of this data by another application. In this case it is necessary to replicate the data that leads to large traffic between application and database engine. Returning to DBMS ConteXt it is important to highlight, that it's architecture looks somewhat different. 2 Storage of data DB-browser, or an application specifically written using the library of access to a DB works on the Database.
All work is performed directly at the server.
The user only has interface to an application or to DB-browser. Thus, traffic between the server and client computer is minimal and data is not transmitted which in turn, boosts safety of such a system. It is clear, that with such organization of operations, it is necessary to launch separate sessions on every client.