DB2 for z/OS Data Sharing - Then and Now

I worked with mainframe DB2 data sharing technology while it was still in beta release in the mid-1990s (DB2 for z/OS V4), and I work with data sharing users to this day. A lot has changed over the past fifteen years, in terms of both the technology itself (e.g., the global locking protocol, internal coupling facilities, structure duplexing) and the ways in which organizations are using it (e.g., configuration preferences, client-server computing). In this session I'll look at a number of aspects of data sharing technology and its utilization in a "then" and "now" fashion, contrasting old and new and providing my perspective on why things have changed and where they're going.