What is the syntax to automatically run code when multi-page page changes?

Private Sub <multipage name>_Change()
   If Me.<multipage name>.Value = <pg index under which code should run> Then
      <code to be run when page is activated>
   End If
End Sub
'example for multipage named "mtp"
Private Sub mtp_Change() 'called whenever active page in multipage changes
   If Me.mtp.Value = 1 Then 'if user opens the "Show Guest List" page
        Call loadGuestLists 'automatically runs this code
   End If
End Sub

What is the syntax to run code every time a cell value changes?

'place code in a sheet under Microsoft Excel Objects
Private Sub Worksheet_Change(ByVal Target As Range)
     If target.Row = Range("<range of cell>").Row And target.Column = Range("<range of cells>").Column Then
        <code to be run here>
     End If
End Sub
'example
Private Sub Worksheet_Change(ByVal Target As Range)
     If target.Row = Range("A1").Row And target.Column = Range("A1").Column Then
        MsgBox("The value of A1 has changed")
     End If
End Sub