... At the Kitt Peak National Observatory, this has included data acquisition using the ICE ( IRAF Control Environment ) package that was developed in coordination with Skip Schaller at Steward Observatory. ... Improvements to ICE are described that support a dual exposure mode implemented via charge shuffling techniques. Charge shuffling involves repeatedly shifting the charge back-and-forth from side-to-side of a CCD while nodding the telescope alternately from an object to a blank sky position. ...