the ControlBox property will remove the min/max/and close button...if you want the other two on you can do this.
Code:
'disable the close and greying out the x of the form window
Private Declare Function GetSystemMenu _
Lib "User32" (ByVal hWnd As Integer, _
ByVal bRevert As Integer) As Integer
Private Declare Function RemoveMenu Lib _
"User32" (ByVal hMenu As Integer, ByVal nPosition As Integer, _
ByVal wFlags As Integer) As Integer
Const MF_BYPOSITION = &H400
Private Sub Form_Load()
Call RemoveMenu(GetSystemMenu(hWnd, 0), 6, MF_BYPOSITION)
End Sub