Since you have already posted the diagram it is clear that you know why WOW64 exists. Tandoori Nights Mp3 Song. Now to answer your question: I'd like to know what happen in this layer. I think you want to know how it is implemented.

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Process startup: The loader loads 64-bit user-mode part 'Ntdll.dll' as usual, but also loads 32-bit Ntdll.dll in case the process is for 32-bit execution. It is now the loaders responsibility to initialize using Wow64.dll, which sets up process and thread contexts in 32-bit Ntdll and 'switches the CPU to 32-bit mode' for execution. System Call: Everything is now running in 32-bit mode, until a system call. We know that system calls go through Ntdll.dll, User32.dll, and Gdi32.dll etc; in this case the 32-bit versions. There is a separate 32-bit version of these libraries located in Windows Syswow64 bit folder. These are just stubs that instead of issuing 'native system calls,' actually call in Wow64.dll. Now, it's simple for Wow64.dll to transition to 64-bit mode, convert parameters to their 64-bit counterparts, issue the system call using 64-bit versions, get the result, and reconvert the output to 32-bit.