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Describe two user-mode process

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Describe two user-mode processes that Windows XP provides to enable it to run programs developed for other operating systems.

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Answer:Environmental subsystems are user-mode processes layered over the native executable services to enable Windows XP to run programs developed for other operating systems.(1)A Win32 application called the virtual DOS machine(VDM)is provided as a user-mode

process to run MSDOS applications.The VDM can execute or emulate intel486 instructions and also provides routines to emulate MSDOS BIOS services and provides virtual drivers for screen,keyboard,and communication ports.(2)Windows-on-windows(WOW32)provides

kernel and stub routines for Windows 3.1 functions.The stub routines call the appropriate Win32 subroutines,converting the 16-bit addresses into 32-bit addresses.


发表于 2018-05-05 21:06:06 回复(0)
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