As you all might know, Apple released iOS 4.0 for iPhone 4, 3GS and iPod devices. One of the major features of iOS 4.0 is that it will bring multi-tasking to all supported devices. Apple iOS 4 multi-tasking is in such a way that it doesn’t affect the battery life and performance of the device. They have selected around seven important services and provided APIs that developers can use to implement multi-tasking in their apps. Currently there is only a selected number of iOS apps that support multi-tasking.
Multitasking in Apple iPhone and iPod with iOS 4.0:
All multi-tasking apps in iPhone or iPod Touch can be accessed by double clicking on the home button. A few apps like Talkonaut, Angry birds, Nimbuzz, have already implemented iOS 4.0 multi-tasking. You can scroll through the multitasking window to find all apps kept open and working in the background. Now press firmly on any required app, and click on red mark appearing at the top left side. This will clear the app from memory and stop it from multi-tasking.