SAN FRANCISCO ( TheStreet) - Apple ( AAPL) threw open the doors of its Worldwide Developers' Conference on Monday, unveiling new hardware and software. While fanboys, journalists and investors didn't get quite everything they wanted, they got plenty to think about.

The buzz surrounding the event, held in San Francisco's Moscone Center West, was akin to a rock concert, with tight security, a line around the block, and an atmosphere of euphoria. Apple events are almost always sold out as the masses eagerly anticipate what's next from the tech giant.
Apple's Worldwide Developers' Conference starts on Monday

The Cupertino, Calif.-based firm certainly impressed its audience of developers, increasing the pressure on hardware rivals such as HP ( HPQ), Dell ( DELL), Research In Motion ( RIMM), and Samsung.

Here are three of the most important things we learned at Apple's WWDC conference:

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