1. universal thunk operating system> A software mechanism allowing a Windows 3. 1 application to call a 32-bit dynamically linked library DLL under Win32s. The Windows 3. 1 application which wants to call an entry in a 32-bit DLL instead calls a corresponding entry in a 16-bit DLL. The programmer must also include code to detect whether the 32-bit DLL is loaded. A 32-bit EXE loads the 32-bit DLL. See also Generic Thunk, Flat Thunk. ["Calling a Win32 DLL from a Windows 3. 1 Application", Win32 SDK Knowledge Base, Article ID Q97785]. [Better explanation?]
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