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Demonstrations of technologies added to the latest developer release (DP4) had much of the crowd applauding wildly. Apple has added support for OpenGL to the OS, and Jobs demonstrated the power of this combining with the PDF-based Quartz imaging model by opening an OpenGL object, and dragging a clipping from a PDF file on to it, which immediately wrapped itself round the object. Jobs then demonstrated the integration of QuickTime into the imaging model by dragging a QuickTime file on to the OpenGL object and wrapping it around it, while the movie was playing.

Jobs also demonstrated a more fully integrated Classic environment, used

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in Mac OS X for running old applications. Selections can now be dragged between Classic applications and newer ones based on Carbon and Cocoa, the two advanced application developer interfaces (APIs) used for creating Mac OS X applications. Explaining the differences between the API's, Jobs claimed that the three tiers - Classic, Carbon, Cocoa - represented 'a gentle migration up the food chain,' adding that Cocoa offered 'the most advanced object oriented environment around today.'

The dock, the part of Mac OS X that allows users to store documents and applications at the bottom of the screen, has also been refined. Instead of being mounted on tiles, each icon is now part of a continuous strip - a change that one WWDC attendee described as being 'much more professional.' Dragging an icon away from the dock now results in a small puff of smoke.

Jobs encouraged developers who have yet to begin work on Mac OS X to do so immediately, claiming 'there are no more reasons not to develop on Mac OS X - the train is leaving the station.' By way of financial encouragement, he added: 'we have lots of co-marketing dollars - talk to us.'