How can I share HWND between 32 and 64 bit applications in Win x64?

Question

MSDN tells me that handles to windows (HWND) can be shared between 32- and 64-bit applications, in Interprocess Communication (MSDN). However, in Win32 a HWND is 32 bits, w

Answer 1

I just received an email from a Microsoft WOW64 developer who confirms:

Handles are 32bit and can be safely truncated/zero extended. It is true for both kernel object handles and USER/GDI handles.