Each message is preceded by a three-character prefix pre, which identifies the component or product that issued the message.
| 
                        
                         Prefix ...  | 
                     
                     
                        
                         identifies the message as coming from ...  | 
                     
                  
| 
                        
                         BOF  | 
                     
                     
                        
                         Beta Base Output Facility component or BSA component  | 
                     
                  
| 
                        
                         BSA  | 
                     
                     
                        
                         Beta Data Management Facility component (BQL)  | 
                     
                  
| 
                        
                         BSV  | 
                     
                     
                        
                         BSA Service Manager  | 
                     
                  
| 
                        
                         CAF  | 
                     
                     
                        
                         _beta caf (Beta CICS Access Facility)  | 
                     
                  
| 
                        
                         IAF  | 
                     
                     
                        
                         _beta iaf (Beta IMS Access Facility)  | 
                     
                  
| 
                        
                         LGF  | 
                     
                     
                        
                         _beta smf (Beta Log Formatter)  | 
                     
                  
| 
                        
                         OCF  | 
                     
                     
                        
                         Beta Open Communication Facility  | 
                     
                  
| 
                        
                         RPG  | 
                     
                     
                        
                         _beta report (BSA Report Generator)  | 
                     
                  
| 
                        
                         SFF  | 
                     
                     
                        
                         Beta Subsystem Function Facility  | 
                     
                  
| 
                        
                         SVC  | 
                     
                     
                        
                         Beta SVC  | 
                     
                  
| 
                        
                         VDF  | 
                     
                     
                        
                         _beta vaf (Beta VTAM Dialog Facility)  | 
                     
                  
| 
                        
                         Prefix ...  | 
                     
                     
                        
                         identifies the message as coming from ...  | 
                     
                  
| 
                        
                         EJM  | 
                     
                     
                        
                         _beta job|z (Beta 48 / Beta 92 EJM)  | 
                     
                  
| 
                        
                         IRM  | 
                     
                     
                        
                         _beta doc|z plus (Beta 97 / Beta 93 Fast Retrieval)  | 
                     
                  
| 
                        
                         OMS  | 
                     
                     
                        
                         _beta log|z (Beta 92)  | 
                     
                  
| 
                        
                         PMS  | 
                     
                     
                        
                         _beta doc|z (Beta 93)  | 
                     
                  
| 
                        
                         QMS  | 
                     
                     
                        
                         _beta check|z (Beta 91)  | 
                     
                  
| 
                        
                         SBL  | 
                     
                     
                        
                         _beta access (Beta 88)  | 
                     
                  
| 
                        
                         SIM  | 
                     
                     
                        
                         _beta access monitor (Beta 89)  | 
                     
                  
| 
                        
                         TOR  | 
                     
                     
                        
                         _beta doc|z transform (Beta 39 / Beta 93 Document Transformer)  | 
                     
                  
| 
                        
                         ZET  | 
                     
                     
                        
                         _beta move (Beta 32)  |