Indicates the source of notification. 
Unit
MSAccess
 Syntax
TMSNotificationSource = (nsClient, nsData, nsDatabase, nsEnvironment,   nsExecution, nsObject, nsStatement, nsSystem,   nsTimeout, nsUnknown);
Values
  
    | Value |     Meaning |   
  
    | 
nsClient     | 
    
Client is the reason of the notification.      | 
  
  
    | 
nsData     | 
    
Data in one or more tables referenced in the underlying query was changed.      | 
  
  
    | 
nsDatabase     | 
    
Database state was changed.      | 
  
  
    | 
nsEnvironment     | 
    
Environment changes that are incompatible with Change notification were applied.      | 
  
  
    | 
nsExecution     | 
    
An error occurred during execution.      | 
  
  
    | 
nsObject     | 
    
One of the underlying objects was changed (altered, dropped, etc.).      | 
  
  
    | 
nsStatement     | 
    
The provided query does not support notifications.      | 
  
  
    | 
nsSystem     | 
    
A system-related event has occurred (like server restart).      | 
  
  
    | 
nsTimeout     | 
    
The subscription timeout has been expired.      | 
  
  
    | 
nsUnknown     | 
    
Used when an option is not recognized.      |