Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long

Public Const SWP_HIDEWINDOW = &H80
Public Const SWP_SHOWWINDOW = &H40

Dim rtn As Long

'hide the taskbar
rtn = FindWindow("Shell_traywnd", "") 'get the Window
Call SetWindowPos(rtn, 0, 0, 0, 0, 0, SWP_HIDEWINDOW) 'hide the Tasbar
'show th taskbar
rtn = FindWindow("Shell_traywnd", "") 'get the Window
Call SetWindowPos(rtn, 0, 0, 0, 0, 0, SWP_SHOWWINDOW) 'show the Taskbar