How to Switch between Open Apps?
When running an app, you can minimize it by simply tapping the Home icon. Getting back to it is not just one click on the taskbar like the way you do ...
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If you install Hangouts on your Android device, it replaces Google Talk. To remove and uninstall Hangouts and bring back GTalk again (Jelly Bean 4.3 users can not use this tip, since Hangouts is the default app on their device) do as follows:
1. Open Google Play
2. Search for Hangouts and open it
3. Tap Uninstall
4. Confirm the warning to uninstall all updates to Hangout as an Android system app
5. GTalk is back :)