Windows operating system logo on a black backgroundWindows operating system logo on a black background
Space marines with weapons conduct military operationsSpace marines with weapons conduct military operations
The logo of the android 4.4 operating system is redThe logo of the Android 4.4 operating system is red
Welcome screensaver of the windows operating systemWelcome screensaver of the Windows operating system
Schematic representation of the operating system on a green backgroundSchematic representation of the operating system on a green background