VCAP, vehicle wide capture of module identification data. The VCAP interpreter tool can view information for all the modules installed in a GM vehicle. For example, check the module's canbus data line, ECU name, ECU ID, part numbers, VIN, Mec state, security seed, and the mileage stored in the IPC, ECM and BCM. The vehicle's mileage records are stored in IPC, ECM and BCM. You can also view other information like vehicle specs, the vehicle's RPO codes etc.
Included is the VCAP DPS Typ4 app, which can be use with DPS to read the VCAP from the vehicle.