Linux.
A single program operating system allows only one program to run at a time.
Yes it is, it allows you to access the internet, download apps and has an operating system.
the very basic os --MS-DOS allows uers to directly have access to hardware
yes
A computer's operating system can be compared to an executive manager; it manages all of the hardware and software. It allows the user to access and modify files, use external devices, and run software.
virtualization
No. Microsoft Access is a database application, not an operating system.
An API (Application Programming Interface) is a set of functions and procedures which allow applications to access the features or data of another application, operating system or service.
Most operating systems native to the computer system allows users to communicate with the computer system
Software has to be written to run on a particular operating system. While there are lots of programming languages that will run on many operating systems, a compiler or runtime engine has to interpret the programming language and translate it into commands that the operating system understands. The Operating System is the foundation of the building. Applications are the structure built on the foundation.
Semaphore data type used to maneuver access to multiple sources. The sources usually pertain to parallel programming, or multi user networks.
A file system allows the operating system to store and organize files on a hard disk.