This reference of all the RI Guru object classes as they appear in Guru.

Class Description	Guru Object Class (ri.sys.ObjClass)
Device definition - the DUT	RiDeviceDef
Device Pins definition	RiDevicePins
Device interface board definition - DIB Board	RiDibDef
Device interface board calibration - DIB Board Calibration	RiDibCal
Fixture definition - Fixture	RiFixtureDef
Fixture calibration - Fixture Calibration	RiFixtureCal
Test exec - Test Executive (Operator Test Interface)	RiTestExe
Testplan - Defines what states the tester changes to to identify failing parts	RiTestplan
Tester definition - System name to serial number mapping (cal data is ref by serial device serial number)	RiTesterDef