I want to learn windows API to program in C++. I don't have msdn. I have downloaded a help file for windows API but it does give me a complete list of parameters for each action. Let us for

LRESULT CALLBACK wp(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam);

In this case, if there is a message that button is clicked with the mouse, it send you the x and y positions lparam. For any other action(not mouse) it will send some thing else.

So I want a complete reference of everything in API.
Is there any other help file which is a COMPLETE refrence for the Windows API functions?