getting handle of child window with input focus

There's a Windows API function that provides various information about
top-level windows, but I can't remember its name. One of the values it
makes available is the window handle of the child window that has the input
focus.

Hopefully that's enough info so someone will think of the name of the
function and post it for me

Thanks,
Bob

typedef struct tagGUITHREADINFO {
DWORD cbSize;
DWORD flags;
HWND hwndActive;
HWND hwndFocus;
HWND hwndCapture;
HWND hwndMenuOwner;
HWND hwndMoveSize;
HWND hwndCaret;
RECT rcCaret;
} GUITHREADINFO, *PGUITHREADINFO;

BOOL GetGUIThreadInfo( DWORD idThread,
LPGUITHREADINFO lpgui
);

DWORD GetWindowThreadProcessId( HWND hWnd,
LPDWORD lpdwProcessId
);

"Bob" <spam@xxxxxx> wrote in message
news:eS8k80v$IHA.4528@xxxxxx