The active cell is the single active cell within the current selection. To retrieve the entire selection, use the RangeSelection property.
To set the active cell, use the IRange.Activate() method.
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2