What is used by operating system to manage all the files of the system? Administrator made some changes on the system hardware and wants to restart without doing manually. How it is possible? Administrator should use which folder to install common software for all users? For increasing degree of multitasking, which hardware space should be utilized? How a user can know the type of the command? User wants to add some tiny applications that he/she can use in his everyday life, how it can be added as? What is required to run the software's by using commands?