How do I toggle the AS/400 device auto configuration feature on and off?

How do I toggle the AS/400 device auto configuration feature on and off? From what I have read I have come to the conclusion that I need to do an attended IPL. A technician who did maintenance on or model 170 showed me how to activate and deactivate the auto configuration feature without performing an IPL. I cannot remember how it was done. Please help me to remember.

The system value QAUTOCFG can be set to 0=Off, or 1=On for Automatically configuring devices.