The internal memory is used to store programs and data. How to store them in an orderly way without interfering with each other, and how to make full and reasonable use of limited space are all things that need to be worried about, and all this is also the business of the operating system.
When you want to use a printer and other devices, just click the printer button to send the content to the printer to stop background printing. Paper Net, a master in www.homelunwen.com, can easily call external equipment because of the operating system, which does not affect the current disposal work, so the management of equipment is also very important.
The manipulation of files is a common occurrence for every user. Every time you access a file, you only need to know the location and file name. Have you ever thought about which channel and which sector the file you want to access is in? Sometimes you don't want my files to be seen by outsiders, but you can also set permissions. These background jobs are all done by the operating system, and you just need to stop operating files.
The operating system also provides two interfaces for users to use: command interface and system call interface. The command interface allows users to use the computer interactively, enter a command, the system will respond and return the result, and the user will enter the next command according to the result, and so on.
System calls are provided for programmers, and each system is a subroutine that can complete a specific function, so that programmers can compile programs on the shoulders of the operating system without compiling all functions from scratch. The functions provided by the operating system only need to be called, which is called takenism. It seems that the operating system has a lot to manage, and it is really not easy to design an excellent operating system.