A Google developer, formerly on the Android team, provides a detailed, fair, and clear explanation of how iPhone OS 4 multitasking will work. Robert Love explains the difference between true background application multitasking and Apple's limited set of APIs that let certain processes continue to operate in the background. He also differentiates serialization (quitting an app while preserving its state precisely) and true background operations. follow link
Use Expose to Open Files Quickly
Looking for an easy way to drag a file into a hidden application? First enter Expose's All Windows mode by hitting F9, then hover over an application's window while dragging your file, pause for a moment (or press the Space bar) and that window will spring to the foreground enabling you to open the file within that application.
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- ExtraBITS for 12 April 2010 (12 Apr 10)
Google Developer Explains iPhone OS 4 Multitasking