No matter which interface you are on the screen, you can go back to the main screen by pressing the soft key "Home" on the bottom right corner of the screen.
By pressing the "Return/Back" Soft key you can backup to the previous screen, until you reach the main screen again.
By pressing the "Last App" Soft Key, the previously used apps will appear.
By pressing the "Screen Shot" Soft key you can take a picture of your current screen.
Note: you have to complete the setup for the icon to appear on the home screen.
please see: "Using The Tablet Screen Shot Feature"
By pressing the "Decrease Sound" Soft Key, you can turn the sound lower.
By pressing the "Increase Sound" Soft Key, you can turn the sound loader.
You can view the strength of your Wi-Fi connection by viewing this meter.
You can view the remaining battery life on your tablet by viewing this meter.
You Quickly jump to the "Google Browser" by pressing this Soft Key
You can use this "Speak To Text" by using this Soft Key.
You can view your "Apps" that are install on your device, by press this Soft Key.