What is difference between cold commissioning and hot commissioning?

you can take the car as sample

before the car key has turn on, the engine is not running, you go to check the brake, windshield, tie, enigne, eletrical system....is installed well or not and the defect of component, this procedure is cold commisonning

after you turn on, the engine is running, then you check again to detect the flaw. this is hot-commissioning

you will always like to know the engine is installed well before you run it and make sure it run well the drive the car.