From ReactOS

Windows XP version of HOOK

typedef struct _HOOK
{
  THRDESKHEAD    head;
  struct _HOOK  *phkNext;
  INT            iHook;
  DWORD          offPfn;
  FLONG          flags;
  INT            ihmod;
  PTHREADINFO    ptiHooked;
  PDESKTOP       rpdesk;
} HOOK, *PHOOK;

References

• 1 http://www.woodmann.com/forum/showthread.php?p=72755
• 2 http://bbs.driverdevelop.com/htm_data/87/0711/107275.html
• 3 http://chpie.tistory.com/entry/Blocking-Global-message-hook
• 4 http://rsdn.ru/forum/message/2816416.1.aspx
• 5 http://msdn2.microsoft.com/en-us/library/ms644959(VS.85).aspx
• 6 http://egnala.egloos.com/370798
• 7 Windows Symbol files, userkdx.dll