Kinda 2 part question.

I was trying to handle an event for when left button is clicked on textbox in a dialog callback proc, how exacelty is this done, do I wait for the message WM_LBUTTONUP or something.
Also So given
BOOL CALLBACK HandleEventsHelper(HWND dhwnd,UINT message, WPARAM wParam, LPARAM lParam)

I pretty much understand what is sent in the UINT and WPARAM. So my question is what is sent in the LPARAM when clicking on textbox control. I cant find any documentation on this. Is it just garbage?



thanks