Single user

A single-user operating system (from mono: 'one'; and user) is an operating system that only It can be occupied by a single user at a given time. Examples of single-user systems are the domestic versions.

It is a system in which the type of user is not defined and, therefore, the data that the system has is accessible to anyone who can connect.

In some operating systems, the player system is accessed by a single user who has permission to perform any operation. This is the case with older operating systems like MS-DOS and some more recent ones like Microsoft's Windows 95/98/Me series or MacOS (before Mac OS X) of Macintosh. In these systems there is no clear differentiation between the tasks carried out by a system administrator and the tasks carried out by regular users, not having the concept of multi-user, a common user has access to all the capabilities of the system, being able to delete, even, information vital to its operation. A malicious user (remote or not) who gains access to the system will be able to do whatever he wants as there are no such limitations.