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This code is for Windows 95 or NT. The SetWindowRgn call is not defined
for Windows 3.x so you can only do it there by sub-classing the window
and handling all drawing yourself. Try starting a new project, set the
borderstyle for Form1 to 0 (None), make the form square and then add
this code:

Private Declare Function CreateEllipticRgn Lib "gdi32" _
(ByVal X1 As Long, ByVal Y1 As Long, _
ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" _
(ByVal hObject As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" _
(ByVal hWnd As Long, ByVal hRgn As Long, _
ByVal bRedraw As Long) As Long
Private hRegion As Long

Sub Form_Load ()
Dim x As Long
Me.ScaleMode = vbPixels
hRegion = CreateEllipticRgn(0, 0, Me.ScaleWidth, Me.ScaleHeight)
x = SetWindowRgn(Me.hWnd, hRegion, True)
End Sub

Sub Form_Unload (Cancel As Integer)
Dim x As Long
Me.Visible = False ' must be gone before region is deleted!
x = DeleteObject(hRegion)
End Sub

Sub Form_Click ()
Unload Me ' need a clean way out! (this is just for testing)
End Sub

To make non-round forms use the other API calls to create a region of
whatever shape is desired. Some of the other region calls are:
Private Declare Function CreateRectRgnIndirect Lib "gdi32" _
(lpRect As RECT) As Long
Private Declare Function CreateRectRgn Lib "gdi32" (ByVal X1 As Long,_
ByVal Y1 As Long,ByVal X2 As Long,ByVal Y2 As Long) As Long
Private Declare Function CreateEllipticRgnIndirect Lib "gdi32" _
(lpRect As Rect) As Long
Private Declare Function CreatePolyPolygonRgn Lib "gdi32" _
(lpPoint As POINTAPI,lpPolyCounts As Long,ByVal nCount As Long,_
ByVal nPolyFillMode As Long) As Long
Private Declare Function CreatePolygonRgn Lib "gdi32" (lpPoint As POINTAPI,_
ByVal nCount As Long,ByVal nPolyFillMode As Long) As Long
Private Const WINDING=2
Private Const ALTERNATE=1
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Type POINTAPI
x As Long
y As Long
End Type
 Non-Rectangular Forms

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