Lower row keys. Your welcome
Answer
program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API). In addition, users can interact directly with the operating system through a user interface such as a command line or a graphical user interface
B- You can adjust the mouse's double-click speed.
Some computer mouse software (depends on brand) will allow you to set new tasks for the mouse to perform. Sometimes there are mice that have extra buttons that can be programmed to do certain tasks.
Computer or calculater.hope this helps
