Mark Cain felt like a rock star. The chief technology officer of medical imaging software company MIMvista got that sensation as he stepped onto the stage at Apple’s Worldwide Developers Conference on June 9 to demonstrate a new program that delivers medical scans to an iPhone. Suddenly he was in front of an auditorium packed with thousands of Apple faithful, reporters and bloggers, all eager for news of the latest iteration of Apple’s music-playing cell phone and the software applications designed to run on it.