How to create a hidden window in C++

Question

How to create a hidden window ?

The purpose of this window is to receive some messages.

Answer 1

Ahh, Just came across an issue. If u fail to specify HWND_MESSAGE unexpected behaviours could occur. I have used NULL which is NOT correct. In my case it caused that MS Excel took 10s or more to load an xls file, while it normally takes less then a second when my app was not running!

MSDN says this as someone mentioned before.