Returns a Range object that represents the active cell in the active window (the window on top) or in the specified window. If the window isn't displaying a worksheet, this property fails. Read-only.
Remarks
If you don't specify an object qualifier, this property returns the active cell in the active window.
Be careful to distinguish between the active cell and the selection. The active cell is a single cell inside the current selection. The selection may contain more than one cell, but only one is the active cell.
The following expressions all return the active cell, and are all equivalent.
ActiveCell
Application.ActiveCell
ActiveWindow.ActiveCell
Application.ActiveWindow.ActiveCell