Application: an primary script (so directly accessed via the Master_Script) on which the rest of the call is pegged against.
Example: A call is routed to DNIS 1234. In the Master_Script it is pegged for opening hours. Within opening hours the call is routed to script "test". This script is now an application.
Within that "test" script you can add another script for example for bank holidays, say to script "bankholidays". This script cannot be an application as the call is transferred by an application and not by the Master_Script to this script.
If you would run an application based report you can report how many calls are presented to the primary script in total but not report on how many calls have been presented to the secondary script.
For CallByCall Statistics to work you have to always include the Master_Script and any application (primary script), otherwise you might not have all required data (e.g. DNIS data missing, CDN data, callerID etc.)
Supernn