>>>>The question is:
>>>>can I determine if I (the user) clicked on this x or it was send from the outside?
>>>
>>>Simple : try with
>>>

>>>#define WM_QUIT                         0x0012
>>>

>>
>>Do you know if the behavior of it must be different than WM_CLOSE? I got the exact same prompt as in case of WM_CLOSE and the program waits for the input. Is it an indication of the problem?
>
>What is ReleaseType - when I tested in the on shutdown it was 0 and not 1

I actually removed the check for ReleaseType - had some discussion yesterday with the boss. But may be you're right and I need to put it back there. It still will have a question, but different - one of the forms I change asks a question to save changes (in Destroy, I think).