1。新建一个VB6的标准EXE工程，然后添加一个模块，将下列代码加入新的模块中：

Option Explicit
                    
Private Declare Function SetWindowLong Lib "user32" Alias _
        "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex _
        As Long, ByVal dwNewLong As Long) As Long
        
Private Declare Function CallWindowProc Lib "user32" Alias _
        "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal _
        hWnd As Long, ByVal Msg As Long, ByVal wParam As _
        Long, ByVal lParam As Long) As Long
        
Const GWL_WNDPROC = (-4&)

Dim PrevWndProc&

Const WM_NCLBUTTONDBLCLK = &HA3
  
Public Sub Init(hWnd As Long)
  PrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubWndProc)
End Sub

Public Sub Terminate(hWnd As Long)
  Call SetWindowLong(hWnd, GWL_WNDPROC, PrevWndProc)
End Sub

Private Function SubWndProc(ByVal hWnd As Long, ByVal Msg As Long, _
                            ByVal wParam As Long, ByVal lParam As Long) _
                            As Long
  
  If Msg = WM_NCLBUTTONDBLCLK Then
     Exit Function
  End If
  
  SubWndProc = CallWindowProc(PrevWndProc, hWnd, Msg, wParam, lParam)
End Function

2。在窗体的Load事件中加入一下代码：

Private Sub Form_Load()
Call Init(Me.hWnd)
End Sub

3。最后在窗体的Unload事件中加入：

Private Sub Form_Unload(Cancel As Integer)
Call Terminate(Me.hWnd)
End Sub
好啦，可以运行我们创建的这个工程了，现在双击窗体的标题栏是不是和以前不一样啊！

：）

以上程序在Win2000中文版、VB6下编译运行通过