The program uses a database (usually in XLS format) to drive the correct loading of the sketches. The database can be created using various databases. XLS formats represent a good compromise, thanks to the relatively low cost of Microsoft Excel, their user-friendly interface and the portability of the data. The operations performed by the program on the database are basically reading and no particular performance in terms of speed is required. XLS/MDB formats being “portable” guarantee the possibility of using the software even during trips to areas where it is not possible to connect to the company network.