1 is my laptop screen
2 is an extra screen on the left, connected to the laptop by means of a usb-vga converter (USB 3.0 to VGA Multi-Display Converter Adapter Cable External Video Graphic Card 1920x1080 USB to VGA Adapter for Windows7/8/10)
3 idem as 2
In my visual basic program I created three forms one form for each screen
On the forms I added a Picturebox to present pictures on the different screens.
To connect a form to a specific screen I used this code:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
TextBox1.Text = CStr(numberofmonitors)
If numberofmonitors > 1 Then
Form2.StartPosition = FormStartPosition.Manual
Form2.Bounds = Screen.AllScreens(1).Bounds
Form2.Show()
End If