VOID keybd_event(
    BYTE bVk,	// virtual-key code
    BYTE bScan,	// hardware scan code
    DWORD dwFlags,	// flags specifying various function options
    DWORD dwExtraInfo 	// additional data associated with keystroke
   );	
 
Parameters
bVk
Specifies a virtual-key code. The code must be a value in the range 1 to 254. 
bScan
Specifies a hardware scan code for the key. 
dwFlags
A set of flag bits that specify various aspects of function operation. An application can use any combination of the following predefined constant values to set the flags: 
KEYEVENTF_EXTENDEDKEY	
If specified, the scan code was preceded by a prefix byte having the value 0xE0 (224).
KEYEVENTF_KEYUP	
If specified, the key is being released. If not specified, the key is being depressed.
 
dwExtraInfo
Specifies an additional 32-bit value associated with the key stroke. 
			
		
 
	
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