public delegate IntPtr WindowMessageHook(
	IntPtr hwnd,
	int msg,
	IntPtr wParam,
	IntPtr lParam,
	ref bool handled
)

Public Delegate Function WindowMessageHook ( 
	hwnd As IntPtr,
	msg As Integer,
	wParam As IntPtr,
	lParam As IntPtr,
	ByRef handled As Boolean
) As IntPtr

public delegate IntPtr WindowMessageHook(
	IntPtr hwnd, 
	int msg, 
	IntPtr wParam, 
	IntPtr lParam, 
	bool% handled
)

type WindowMessageHook = 
    delegate of 
        hwnd : IntPtr * 
        msg : int * 
        wParam : IntPtr * 
        lParam : IntPtr * 
        handled : bool byref -> IntPtr