The 
                  		KEYCHECK option specifies whether the File Handler checks that the key definition defined in your application matches that of the
                  indexed file you are opening.
                  	 
 
            	 
            
               Syntax:
 
               		 
               		
                
                  		    
                  			 KEYCHECK 
                  			 = 
                  			  {  
                  				ON 
                  			  }  
                  			  {  
                  				OFF 
                  			  }  
                  		    
                  		
               
 
               	 
              
            	 
            
               Parameters:
 
               		 
               		
                
                  		   
                  			 
                  - ON
                     			 
                  
- All key definitions must match; otherwise a 3/9 error is returned.
                     			 
                  
- OFF
                     			 
                  
- Open the file, regardless of whether key definitions match or not. Any explicit reference, in the program, to a key which
                     does not match an actual key in the file,results in an error at the time of reference.