The libraries that make up Open Client are:
DB-Library, a collection of routines for use in writing client applications. DB-Library includes a bulk copy library and the two-phase commit special library. DB-Library provides source-code compatibility for older Sybase applications.
Client-Library, a collection of routines for use in writing client applications. Client-Library is a library designed to accommodate cursors and other advanced features.
CS-Library, a collection of utility routines that are useful to both client and server applications. All Client-Library applications will include at least one call to CS-Library, because Client-Library routines use a structure which is allocated in CS-Library.