
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 in Windows. But the Android way is pretty straightforward too.
- Tap the Recent Apps icon
to reveal the apps that you recently opened. (Note 2)
- Slide down to see more recent apps.
- Tap a screenshot from the list to instantly switch to the app.
Note 1: You can clear the recent apps from the list by swiping them sideways one by one.
Note 2: On Android 2.x, touch and hold the Home button to reveal recent apps.
The
Android system doesn't need you to close a running app for every
instance. But in some cases you may need to force stop an app that's
misbehaving, or like playing a game, you may need to actually close the
app in order to start a new level rather than continuing the last. Here
are the steps to follow:
- Run the Settings app and tap Apps under DEVICE.
- Select the app you want to close.
- Tap the 'Force stop' button and tap 'OK' to confirm.

In
Android, you can set a file to open with a certain program by default
as you do in Windows. For example, if you have installed an image viewer
such as QuickPic, the system will ask you to select an app when you try
to open an image file (
See the screenshot).
- To set a default app to open the file, check 'Use by default for this action' before you tap that app.
The next time you tap an image file, it will always open with the app you've selected without asking you again.
What if you need to clear the default app?
- Run the Settings app and tap Apps under DEVICE.
- Choose the app you do not want to launch by default.
- Tap 'Clear defaults' under LAUNCH BY DEFAULT.

Installing
apps from the Google Play store to your Android device is convenient,
likewise removing them is pretty straightforward.
- Tap the All Apps icon
on the tray and select the Apps tab on the top.
- Touch and hold the icon of the app you want to uninstall.
- Drag
and drop the app icon over the Uninstall icon then tap 'OK' to confirm.
(The Uninstall icon appears only for the app that can be uninstalled
from the system.)
Alternatively, you can run the Settings app, tap Apps under DEVICE then select the app you want to uninstall from the list.