The "SOUND" button toggles the audio on and off. Tab key toggles the current view mode circularly. For example, toggles smooth scrolling mode on and off. In its place is Action Center, which displays notifications and settings toggles. By pressing 4 on the controller keypad, the player toggles on or off a cross-hair. Whenever it reads a set pixel, it toggles filling mode on or off. Feature toggles may allow shorter software integration cycles. Feature toggles are essentially variables that are used inside conditional statements. Thus codice 6 when used in a loop toggles its values between 1 and 0. Feature groups consist of feature toggles that work together. Where necessary, partially complete features can be disabled before committing, using feature toggles for instance. Pressing "A" and "C" simultaneously toggles the sound. Control is available using brake toggles for roll and a hand-held throttle for pitch. In some networks, pressing R toggles between the calls, similar to North America. Feature toggles are an important technique used for the implementation of continuous delivery.