Private Declare Function SendMessage Lib "user32" _
Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long

Private Const WM_SYSCOMMAND = &H112
Private Const SC_TASKLIST = &HF130

Private Sub Command1_Click()
SendMessage hWnd, WM_SYSCOMMAND, ByVal SC_TASKLIST, ByVal 0&
End Sub