We can create a on screen digital clock. On screen means the clock will stay on all windows and in the center of the computer screen

Imports System.Windows.Forms

Public Class Form1

    Public Const WM_NCHITTEST = &H84

    Dim rcCaption As Rectangle

    Public Enum HitTestResult

        HTBORDER = 18

        HTBOTTOM = 15

        HTBOTTOMLEFT = 16

        HTBOTTOMRIGHT = 17

        HTCAPTION = 2

        HTCLIENT = 1

        HTERROR = (-2)

        HTGROWBOX = 4

        HTHSCROLL = 6

        HTLEFT = 10

        HTMAXBUTTON = 9

        HTMENU = 5

        HTMINBUTTON = 8

        HTNOWHERE = 0

        HTRIGHT = 11

        HTSYSMENU = 3

        HTTOP = 12

        HTTOPLEFT = 13

        HTTOPRIGHT = 14

        HTVSCROLL = 7

        HTTRANSPARENT = (-1)

        HTOBJECT = 19

        HTCLOSE = 20

        HTHELP = 21

    End Enum

Public Sub FakeCaptionForCaptionlessWindow(ByVal fParent As Form, ByRef m As Message, ByVal CaptionRectangle As Rectangle)

        If m.Msg = WM_NCHITTEST Then

            Dim ptClickLocation As New Point(m.LParam.ToInt32)

            ptClickLocation = fParent.PointToClient(ptClickLocation)

            If CaptionRectangle.Contains(ptClickLocation) Then

                m.Result = New IntPtr(HitTestResult.HTCAPTION)

            Else

                m.Result = New IntPtr(HitTestResult.HTCLIENT)

            End If

        End If

    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        Me.TextBox1.Text = Now.ToLongTimeString

    End Sub

    Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

        e.Graphics.FillRectangle(New SolidBrush(Color.Blue), rcCaption)

    End Sub

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)

        If m.Msg = WM_NCHITTEST Then

            Call FakeCaptionForCaptionlessWindow(Me, m, rcCaption)

        Else

            MyBase.WndProc(m)

        End If

    End Sub

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

    End Sub

End Class