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A modern computer operating system usually uses virtual memory to provide separate address spaces called user space and kernel space. [a] Primarily, this separation serves to provide memory protection and hardware protection from malicious or errant software behaviour. Kernel space is strictly reserved for running a privileged operating system ...
In Unix systems, the username is correlated with a user identifier or user ID. Computer systems operate in one of two types based on what kind of users they have: Single-user systems do not have a concept of several user accounts. Multi-user systems have such a concept, and require users to identify themselves before using the system.
A graphical user interface, or GUI ( / ˈɡuːi / [1] [2] GOO-ee ), is a form of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation. In many applications, GUIs are used instead of text-based UIs, which are based on typed command labels or text navigation.
In computing, a shell is a computer program that exposes an operating system 's services to a human user or other programs. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is the outermost ...
The Windows Registry is a hierarchical database that stores low-level settings for the Microsoft Windows operating system and for applications that opt to use the registry. The kernel, device drivers, services, Security Accounts Manager, and user interfaces can all use the registry. The registry also allows access to counters for profiling ...
A computer(-based) information system is essentially an IS using computer technology to carry out some or all of its planned tasks. The basic components of computer-based information systems are: Hardware are the devices like the monitor, processor, printer, and keyboard, all of which work together to accept, process, show data, and information.
The Portable Operating System Interface ( POSIX; IPA: / ˈpɒz.ɪks / [1]) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. [1] POSIX defines both the system and user-level application programming interfaces (APIs), along with command line shells and utility interfaces, for ...
End user. In product development, an end user (sometimes end-user) [a] is a person who ultimately uses or is intended to ultimately use a product. [1] [2] [3] The end user stands in contrast to users who support or maintain the product, [4] such as sysops, system administrators, database administrators, [5] information technology (IT) experts ...