Advanced Customization > Info*Engine User’s Guide > Info*Engine Data Management > Managing and Manipulating Groups with Info*Engine > Sending and Retrieving Data Groups from Adapters
  
Sending and Retrieving Data Groups from Adapters
When you are working with data that is targeted for an information system, you get the data to the adapter that interfaces with the information system by specifying the GROUP_IN parameter on adapter webject you want to use. Only those groups specified on the GROUP_IN parameter are delivered to the adapter. All other groups in the VDB are not available to the adapter.
When you are working with data that is coming from an information system, name the group in which the data is returned by specifying the GROUP_OUT parameter on adapter webject you want to use. If for some reason the complete group cannot be returned, the adapter indicates this to Info*Engine and Info*Engine throws an exception. After executing adapter webjects that pull data from an information system, you should always check for possible exceptions.