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'Forms - How to Confine a Form to another Form

Option Explicit
 
'Add two forms to your project.
Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
 
'Add the following code to your first form (named Form1):
Private Sub Form_Load()
    Load Form2
    Form2.Show
End Sub
 
'Add the following code to your second form (named Form2):
Private Sub Form_Load()
    SetParent Me.hWnd, Form1.hWnd
End Sub