From google search:
Smart Hot Start
Brings the puddle temperature up quickly for good initial penetration. The amount of Hot Start is dependent on the weld puddle temperature. The Workhorse measures the time in between welds. The longer the period between stopping and starting, the greater the Hot Start current. If the arc is broken for less than a second, the Hot Start is eliminated. This prevents the puddle from overheating and burning through.
Arc Force
This allows the operator to adjust the current surge which results when a drop shorts the arc.
http://www.arconweld.com/portable_welding_machines/portable_mig_welders.htm