OK, got some more testing done with the Tech 2 and TIS 2000 program: Tech 2 View: Computer representation of Tech 2 Screen. You can control Tech 2 with computer keyboard. Service Programming System: If you forget to put security key in PC. With security key connected. Not actually connected to car.
I used the tis 2000 disc for ecm updates. TIS2000 CD for GM TECH2 GM Car Model since the TIS200 has all the firmware needed for cars up to 2009, and does not need to connect to GM to pull them down. As for the 2010 to 2013 cars, need