You can set notifications for ON-units in CodeWatch, either from the command line or from GUI CodeWatch. 
	 
 
	 Using Command-line CodeWatch
 
		 
		 
		  - Use the CATCH command to turn notification on for a specified ON-unit. 
		  
- Use the NCATCH command to turn notification off for a specified ON-unit. 
		  
-  Use the LCATCH command to list the catch status of a specified ON-unit/signal, or the state of all signals and ON-units. 
		  
See the help topics for the CATCH, NCATCH, and LCATCH commands for details and examples of using these commands. 
		
 
	 Using GUI CodeWatch
 
		 
		While debugging your PL/I program in GUI CodeWatch, do the following to set notification for specific ON-units: 
		
 
		 
		  - Choose 
			 . The Configure On Unit Exceptions dialog box appears with the supported ON-units. 
		  
- Select the check box of the supported ON-units for which you want to turn on notification, and clear the check box of the supported ON-units for which you want to turn off notification. 
		  
- Click 
			 OK.