The Messagebox Function
The messagebox function create,displays and operates amessagebox.
The messagebox contion an application -defined message and title,plus any combination of predefine action and push buttons.
Messagebox (Null,"Hellow World","My first Program....."MB_InconINFORMATION,MB_OK);
//(handle to owner window,text in messagebox title,messagebox style ie icon and buttons)
//is a binary or operate
   	VALUE					MEANING
MB_ABORTETRVGNORE			The messagebox contains three push buttons
					Abort Retry and Ignore.


MB_CANCELTRVCONTINUE			window 2000;the messagebox cpntains three
					push buttons cancle,Try Again,continuE

Use this message box type instead of MB_ABORTRETRVINGNORE

MB_HELP					window 95/98,window NT4.0 and later:adds
					a help button to the messagebox.


Wheb the user click the help button or press F1,the system send aWM_HELP mesasage to the 
owner.