mx = xtra("Msg").new()

-- send message WM_LBUTTONDOWN to a specific window identified by HWND hwnd
WM_LBUTTONDOWN = 513
MK_LBUTTON = 1
lParam = 65536*y + x
mx.send_msg (hwnd, WM_LBUTTONDOWN, MK_LBUTTON, lParam)

-- listen for WM_COPYDATA and WM_MOUSEWHEEL messages sent to current application
-- window, notify Lingo callback function 'msgReceived' when such messages occur.
-- This callback function will receive hwnd, message, wParam and lParam as arguments
-- (and for WM_COPYDATA messages also the data that was sent as ByteArray).
WM_COPYDATA = 74
WM_MOUSEWHEEL = 522
mx.msg_listen([WM_COPYDATA, WM_MOUSEWHEEL], VOID, #msgReceived)