Are you asking what it does? It won't allow you to shift into any other gear other than fourth when the ecm summons it. You can shift into any other gear after shifting into fourth. It's basicaly just an annoying electronic nanny.
You can go with a tune or the CAGS defeat to get rid of it. I like it better removed because I had to play with it once when I needed a gear in traffic. Feel better with it turned off.
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2003 Z06 - Tint | C6 Z06 Shifter w/Knob | GHL 2-Tip Magnums | Z06 Exhaust Plate | Hood Seal | Zip-Tie Intake | 1-4 Shift Defeat | NGK TR 55s | Nitto 555 RIIs.
My BPP Shifter Broke In Two!! 
Bad Slave Cylinder = New Clutch
