Deciding What Kind of Function to Write

The installable functions that are called by the system during the form processing are:

• nActivate window functions
  
  
• nSuspend window functions
  
  
• nBegin-form functions
  
  
• nEnd-form functions
  
  
• nBegin-field functions
  
  
• nEnd-field functions
  
  
• nBegin-scrollable region functions
  
  
• nEnd-scrollable region functions
  
  
• nBegin-row scrollable region functions
  
  
• nEnd-row scrollable region functions
  
  
• nEvent functions
  
  
• nField validation functions
  
  
• nForm validation functions

You should analyze the task you want done and determine at which point during form processing it is best carried out.