There are function keys on the keyboard to enable or disable the specific applications. Please refer to the attached file to check the function keys and its corresponding function assignments. However, if the notebook does not equip with Chiclet keyboards, then you can kindly refer to the user manual for more information; or for reference, please check the following key assignments: Fn + F2 Switch the display output mode between the LCD, external monitor and both. Fn + F3 Enable or disable the touchpad function. Fn + F4 Decrease the LCD brightness. Fn + F5 Increase the LCD brightness. Fn + F7 Decrease the built-in speaker’s volume. Fn + F8 Increase the built-in speaker’s volume. Fn + F9 Disable the computer’s audio function. Fn + F12 Force the computer into suspend mode (depending on the system configuration).