are you talking about selecting a cell with a row or are you talking about
hovering the mouse over a cell (probably not easily doable)?

If selecting, then use the SelectionChange event

Try this for a starter idea. Paste the following event code into the
worksheet code module. When you double-click a cell, it toggles Status
Bar info on and off. Then select a cell, the info will appear on the
Status Bar. Double-click any cell again to toggle Status Bar reporting
off. The following code just uses column $A for its info. This avoids
having MsgBoxes popping up at each selection change.

Private blnStatusMsgOn As Boolean

'----------------------------------------------------------------------
Private Sub Worksheet_BeforeDoubleClick(ByVal Target As Range, _
                                       Cancel As Boolean)

 blnStatusMsgOn = Not blnStatusMsgOn
 Worksheet_SelectionChange ActiveCell
End Sub

'----------------------------------------------------------------------
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
 Dim rngColA As Range

 Set rngColA = Target.EntireRow.Resize(1, 1)

 If blnStatusMsgOn _
   Then
     Application.StatusBar = "Info is '" & rngColA.Value & "'."
   Else
     Application.StatusBar = False
   End If
End Sub