0 =OK button only
1 =OK and Cancel buttons
2 =Abort, Retry, and Ignore buttons
3 =Yes, No, and Cancel buttons
4 =Yes and No buttons
5 =Retry and Cancel buttons
16 =Critical Message icon
32 =Warning Query icon
48 = Warning Message icon
64 =Information Message icon
0 = First button is default
256 =Second button is default
512 =Third button is default
768 =Fourth button is default
0 =Application modal (the current application will not work until the user responds to the message box)
4096 =System modal (all applications wont work until the user responds to the message box)