Low level mouse hook

Helloooo,
Im fed up i search during 30 min, and don't find a good tutoriel for low level mouse hook if some one can give me a link or teach me for low level mouse hook this will be great. I want make a mouse mouvement if the left and right button is press, i have already make a script with mouse event, but I want try the low level mouse hook because some peoples says me is better to use the low level mouse hook.
thks