The DCAS can be used by providers of logon and single sign-on services where access to z/OS-based applications is needed. The DCAS is a TCP/IP server that enables clients to connect over the network and obtain a PassTicket and z/OS® user ID from a SAF-compliant product, such as RACF®. This topic refers to RACF as the SAF product.

A PassTicket is like a temporary password, because it is valid for only a short period of time. Applications on z/OS can be configured to support logon access with PassTickets. For information about PassTickets, see z/OS Security Server RACF Security Administrator's Guide.

IBM® does not provide header files or samples for programming DCAS clients, but the specifications for developing a client are defined in the following topics.