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===Thunking===
{{Main article|Thunk}}
The WOW subsystem of the operating system {{Clarify|text=thunks legacy 16-bit APIs to their newer 32-bit equivalents}} in order to provide support for 16-bit [[pointer (computer programming)|pointer]]s, memory models and [[address space]].
All 16-bit programs run by default in a single [[virtual DOS machine]] with shared memory space. However, they can be configured to run in their own separate memory space, in which case each 16-bit process has its own dedicated virtual machine. The separate memory space increases system stability by preventing buggy 16-bit programs from interfering with one another, at the expense of reduced 16-bit [[inter-process communication]] and increased memory utilization.
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