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Q. Does Windows XP offer any user-mode processes that enable it to run programs developed for other operating systems? Describe two of these subsystems.
Answer: Environmental subsystems are user-mode processes layered in excess of the native executable services to enable Windows XP to run programs developed for other operating systems.
(1) A Win 32 application called the virtual DOS machine (VDM) is offer as a user-mode process to run MS-DOS applications. The VDM can perform or emulate Intel 486 instructions and also provides routines to emulate MS-DOS BIOS services and provides virtual drivers for screen and keyboard and communication ports.
(2) WOW32 (Windows-on-windows) provides kernel as well as stub routines for Windows 3.1 functions. The end routines call the appropriate Win32 subroutines converting the 16-bit addresses into 32-bit addresses.
Q. Name two differences between logical and physical addresses? Answer: A logical address doesn't refer to an actual existing address rather it refers to an abstract address in
Write a short note on peer-to-peer computing. Peer-to-peer (P2P) system model is a kind of distributed OS. In this model, clients and servers aren't distinguished from one anot
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Q. Why is it important to scale up system bus and device speeds as the CPU speed increases? Answer: Consider a system which carries out 50% I/O and 50% computes. Doubling-up
what is inter process communication..
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WHAT IS ACYCLIC GRAPH DIRECTORY
What are overlays? To enable a process to be larger than the amount of memory allocated to it, overlays are used. The idea of overlays is to keep in memory only those instructi
Q. Under what conditions do page faults occur? Explain the actions taken by the operating system when a page fault occurs. Answer: A page fault take places when an access to
Define the properties operating systems: Batch :- Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequenc
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