Apple chief executive Steve Jobs has used the opening keynote of the Worldwide Developer Conference (WWDC) to show off upgrades to Mac OS X and iOS, and to launch iCloud, a wireless storage and synchronisation service for Apple devices.
Mac OS X Lion includes support for multi-touch screen controls, and allows full screen application running for the first time.
Phil Schiller, senior vice president of product marketing at Apple, said that 73 per cent of Mac customers use notebooks, and that Apple's existing hardware will support the multi-touch controls.
The Exposé and Spaces tools for systems management have been combined into a Mission Control feature, which provides a dashboard of open applications and windows, and a LaunchPad application manager.
The system settings for computers can be automatically saved and restored on restart with a Resume function.
An Auto Save feature, meanwhile, takes regular backups of documents, and the Versions application lets the user scroll between these, and cut and paste between them. Air Drop now uses an encrypted peer-to-peer connection to transfer documents between users.
The email system has also been updated to show conversations in a streaming format similar to Gmail, and searching has been improved - all with no advertisements, Schiller joked.
Mac OS X Lion will go on sale in July exclusively through Apple's App Store for $20.99, a steep reduction from the previous $129 upgrade fee.
The latest upgrade to iOS will not arrive until the autumn, Jobs said, but the beta version of iOS 5 is available today for developers. For the first time users will not need a PC to activate and update an iOS device, but can just connect via Wi-Fi.
"Perhaps iOS 5's paramount feature is that it's built to seamlessly work with iCloud in the post-PC revolution that Apple is leading," Jobs said.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007