Sub templateNotification(server As String, file As String)
  Dim templateDb As NotesDatabase
  Dim templateName As String
  Dim db As NotesDatabase
  Dim directory As NotesDbDirectory
  Dim doc As NotesDocument
  Set templateDb = New NotesDatabase( server, file )
  templateName = templateDb.TemplateName    
  Set directory = New NotesDbDirectory( server )
  Set db = directory.GetFirstDatabase( DATABASE )
  While Not ( db Is Nothing )
    If ( db.DesignTemplateName = templateName ) Then
      Call db.Open( "", "" )
      Set doc = New NotesDocument( db )
      doc.Form = "Memo"
      doc.Subject = "Template changes in " & templateName
      doc.Body = "The template " & templateName &  _
      " will be modified tomorrow."
      Call doc.Send( False, db.Managers )  
    End If
    Set db = directory.GetNextDatabase
  Wend
End Sub
A call to this sub might look like this:
Call templateNotification( "Caracas", "mail4.ntf" )