Steve Jobs unveils nothing new at Apple's annual conference

Apple CEO Steve Jobs briefly emerged from a medical leave Monday to unveil a free service that lets customers share calendar entries, songs and other files among their devices more easily.

The company also announced new software to make Mac computers behave more like mobile devices and Apple's mobile devices more like rival smartphones.

Jobs received a standing ovation as he appeared at Apple Inc.'s annual developers' conference, his second major public appearance since he went on medical leave in January for unspecified reasons and duration, informs Worcester Telegram.

Apple also unveiled a messaging system called iMessage that serves as a text-message replacement for users who are conversing on iOS devices. Users can send texts, photos and videos from an iPad to an iPhone, for example, and then view replies later using a synchronized iPod Touch or other Apple device.

Users can swipe down from the top of the screen and immediately see weather, stock market data, and a list of information about recent phone calls, text messages, e-mails and more, San Francisco Chronicle, reports San Francisco Chronicle.