Apple appears to be headed toward unifying its multiple operating systems via a design makeover, and the iPad will start looking more like a personal computer, according to presentations aired Monday at the company's annual Worldwide Developers Conference.

After 15 years, the iPad is getting some key software features—like the addition of resizable and movable windows—that help it realize its true destiny.

The new interface, called Liquid Glass, was introduced Monday at Apple’s annual Worldwide Developers Conference.