Public Class Form1
    Private WithEvents t As New Timer
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        t.Start()
    End Sub
 
    Private Sub t_Tick(ByVal sender As Object, ByVal e As System.EventArgs) _
      Handles t.Tick
        Static mbutton As String = "None"
        Dim mb As String = Control.MouseButtons.ToString
        If mbutton <> mb Then
            mbutton = mb
            MouseButtonChange(mb)
        End If
    End Sub
    Private Sub MouseButtonChange(ByVal mb As String)
        Console.Beep(1000, 50)
        Me.Text = mb
    End Sub
End Class