Transaction security allows you to control access to individual transactions.
            
            To enable security for a transaction, you must do two things:
            
            
               
               -  Define a set of security keys for the transaction in its PCT entry. Each security key is a number in the range 1 through
                  64. 
               
-  Specify a set of security keys in a user's SNT entry. A user can access a transaction if at least one of the transaction's
                  security keys matches a security key specified in that user's SNT entry.
               
If you assign security key number 1 to a transaction, any user can run the transaction; all users own security key 1 by default.
               Figure 9-1 illustrates security key checking applied to a transaction. 
            
            
            
               
               Figure 1. Transaction key checking
                  
                  