Drill processes are simply TI processes that you create or define in a different way than the method of creating and saving TI processes described earlier in this book.
A drill-through process is used to define the detailed or related data (the data that will ultimately be displayed or opened in a new window). The TM1 cube, that is, the source (displays the master or original data, or where the drill-through originates) is known as or is referred to as the origination cube.
Another way to think about a drill process is that it is the Cognos TM1 object that is used to specify the connection information in a drill-through.