Not thick at all. Just shows a willingness to learn more :)
The Jaguar diagnostics software runs on a PC with a special adaptor Bernard. Several club members, including myself, have a setup, as do Jaguar dealerships and independents.
On a car of your model year it would use "Symptom Driven Diagnostics" often abbreviated to SDD. It can be used for programming, setting options, diagnosing and clearing faults etc.