its 8 injector drivers and 4 ignition drivers. you use 6 of the injector drivers to drive the injectors the other two can be programed to do other things, in mine one does the thermo fan and i think the other does the idle solenoid and 3 ignition drivers to run the wasted spark ignition.
http://www.vi-pec.com/page_files/QuickTune.html
You open quicktune from within the vipec software http://www.vi-pec.com/page_files/software.htm
i have this hooked into my car running wideband closed loop http://wbo2.com/2j/default.htm and it was also used by the tuner with quicktune.