The DEBUGHOOKINFO structure contains debugging information passed to a WH_DEBUG hook procedure, DebugProc.
typedef struct tagDEBUGHOOKINFO { // dh 
    DWORD  idThread; 
    DWORD  idThreadInstaller; 
    LPARAM lParam; 
    WPARAM wParam; 
    int    code; 
} DEBUGHOOKINFO; 
 
  Windows NT: Requires version 3.1 or later.
  Windows: Unsupported.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.
Hooks Overview, Hook Structures, DebugProc, SetWindowsHookEx