A little bit about DOS
The operating system is a program that is loaded when the computer is turned on. It performs a dialogue with the user, manages the computer, its resources (RAM, disk space, etc.), launches other (applied) programs for execution. The operating system Provides the user and application programs with a way of communicating (interface) with the devices of the computer.
The DOS operating system allows using special characters (reserved) names to enter and display information not only with files on disks, but also with various computer devices. In this case, work with these devices is the same as with files, only in the corresponding command, instead of the file name on the disk, specify the device name.
The DOS command is executed by the command.com command processor. The use of internal and external DOS commands refers to the area of system programming.
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