ASM Community

I have actually three questions.
First is why GetParent doesn't work? I hook wnd messages in my app, and when i try to GetParent from hook proc using wnd hadle which is child for sure (i checked it in Spy++) it return handle of that same window.
Second question is how to hook messages which are sended not posted. It seems that standard win hooks cannot hook those messages, while Spy++ hooks it perfectly.
Third is what is message nesting level?

I use win xp pro