What is the purpose of the Windows16 execution environment?What limitations are imposed on the programs executing inside this environment?What are the protection guarantees provided between different applications executing inside the Windows16 environment?What are the protection guarantees provided between an application executing inside the Windows16 environment and a 32-bit application?
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Answer:Windows 16 execution environment provides a virtual environment for executing 16-bit applications that use the Window 3.1 kernel interface.The interface is supported in software using stub routines that call the appropriate Win32 API subroutines by converting 16-bit
addresses into 32-bit addresses.This allows the system to run legacy applications.The environment can multitask with other processes on Windows XP.It can contain multiple Windows16 applications,but all applications share the same address space and the same input queue.Also one can execute only one Windows16 application at a given point in time.A Windows16 application can therefore crash other Windowsl6 applications by corrupting the address space but they cannot corrupt the address spaces of Win32 applications.Multiple Windows16 execution environments could also coexist.