So, are you running the secondary display as an extended desktop?
If so, then you just simply need to know where the display is located in reference to the primary. For example, while testing at home, I have my 10.4" TS setup as a secondary monitor that is simply an extended desktop, located at -800,0 in reference to the primary. To get a form to display just on that screen, simply dynamically place it there in the form's load event... Something like:
Code:
With Me
.Location = New Point(-800,0)
.WindowState = Maximized
End With
This should display the secondary form on the secondary screen, and fill it.