text: **7.8 User exits**
  
  A*user exit*is a point during processing where control is handed from the indexer program to a 
  user-written program. After the user-written program finishes, the control is handed back to 
  the indexer program. 
  
  The ACIF indexer and the OS/390 indexer support multiple user exits. The OS/400, PDF, 
  XML, and Generic indexers do not support any user exits. 
  
  For a description of the ACIF user exits in detail, see 11.2, “ACIF exits” on page 242. 
  
  For a description of the OS/390 indexer user exits, see 11.3, “OS/390 indexer exits” on 
  page 248. 