Apple's Worldwide Developers Conference (WWDC) in the San Jose Convention Center (May 13-16) was the first show after the purchase of NeXT, and focused on the efforts to use OpenStep as the foundation of the next Mac OS. The plan at that time was to introduce a new system then known as Rhapsody, which would consist of a version of OpenStep modified with a more Mac-like look and feel, the Yellow Box, along with a Blue Box that allowed existing Mac applications to run under OS emulation. The show focused primarily on the work in progress, including a short history of the development efforts since the two development teams had been merged on February 4. Several new additions to the system were also demonstrated, including tabbed and outline views, and a new object-based graphics layer (NSBezier). Source: wikipedia.org