A client application is a program that accesses a data server. If you use SAP ASE as the data server, you can create client applications using Open Client/Server™, Embedded SQL™, SAP® PowerBuilder®, or any other front-end development tool that is compatible with Client/Server Interfaces™ (C/SI).
Client applications should update only the primary data. Replication Server distributes the changes to the other sites. Client applications that do not modify data do not need to distinguish between primary and replicated data.