Public Class Form1

    Public Const WM_HOTKEY = &H312

    Public Const MOD_ALT = &H1

    Public Const MOD_CONTROL = &H2

    Public Const MOD_SHIFT = &H4

    Public Const GWL_WNDPROC = (- 4 )

    Public Declare Auto Function RegisterHotKey Lib "user32.dll" Alias _

        "RegisterHotKey" ( ByVal hwnd As IntPtr , ByVal id As Integer , ByVal fsModifiers As Integer , ByVal vk As Integer ) As B oolean

    Public Declare Auto Function UnRegisterHotKey Lib "user32.dll" Alias _

        "UnregisterHotKey" ( ByVal hwnd As IntPtr , ByVal id As Integer ) As Boolean

    Private Sub Form1_Load( ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase .Load

       RegisterHotKey(Handle, 0 , MOD_CONTROL, Asc( "T" ))

    End Sub

    Private Sub Form1_FormClosed( ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles MyBase .FormClosed

       UnregisterHotKey(Handle, 0 )

    End Sub

    Protected Overrides Sub WndProc( ByRef m As Message)

        If m.Msg = WM_HOTKEY Then

            If Visible Then

               Hide()

            Else

               Show()

            End If

        End If

        MyBase .WndProc(m)

    End Sub

End Class