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2. Operating system - Wikipedia

   en.wikipedia.org/wiki/Operating_system

   An operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and other ...

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Free ( Mozilla Public License) an Office suite; allows to export (and import, with accuracy limitations) PDF files. Microsoft Word 2013. Proprietary. Desktop software. The 2013 edition of Office allows PDF files to be converted into a format that can be edited. Nitro PDF Reader. Freeware.

4. System software - Wikipedia

   en.wikipedia.org/wiki/System_software

   A kernel is the core part of the operating system that defines an Application programming interface for applications programs (including some system software) and an interface to device drivers. Device drivers and devices firmware, including computer BIOS , provide basic functionality to operate and control the hardware connected to or built ...

5. List of operating systems - Wikipedia

   en.wikipedia.org/wiki/List_of_operating_systems

   Pilot operating system – written in the Mesa language and used on Xerox Star workstations. PERQ Operating System (POS) – written in PERQ Pascal. Other proprietary non-Unix-like. Operating system for Эльбрус-1 (Elbrus-1) and Эльбрус-2 – used for application, job control, system programming, implemented in uЭль-76 (AL-76).

6. Systems programming - Wikipedia

   en.wikipedia.org/wiki/Systems_programming

   Systems programming, or system programming, is the activity of programming computer system software.The primary distinguishing characteristic of systems programming when compared to application programming is that application programming aims to produce software which provides services to the user directly (e.g. word processor), whereas systems programming aims to produce software and software ...

7. Timeline of operating systems - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_operating_systems

   1953. DYSEAC - an early machine capable of distributing computing. 1955. General Motors Operating System made for IBM 701 [2] MIT 's Tape Director operating system made for UNIVAC 1103 [3] [4] 1956. GM-NAA I/O for IBM 704, based on General Motors Operating System.