Paul,

Try this

Structure RECT
 Public left, top, right, bottom As Integer
End Structure

Structure GUITHREADINFO
 Public cbSize As Integer
 Public flags As Integer
 Public hwndActive As IntPtr
 Public hwndFocus As IntPtr
 Public hwndCapture As IntPtr
 Public hwndMenuOwner As IntPtr
 Public hwndMoveSize As IntPtr
 Public hwndCaret As IntPtr
 Public rcCaret As RECT
End Structure

Structure SECURITY_ATTRIBUTES
 Public nLength As Integer
 Public lpSecurityDescriptor As IntPtr
 Public bInheritHandle As Boolean
End Strucure

Declare Auto Function CreateWindowStation Lib "user32.dll" (lpwinsta
As String, dwFlags As Integer, dwDesiredAccess As Integer, lpsa As
IntPtr) As IntPtr

Declare Function SetProcessWindowStation Lib "user32.dll" (hWinSta As
IntPtr) As Boolean

Declare Auto Function CreateDesktop Lib "user32.dll" (lpszDesktop As
String, lpszDevice As IntPtr, pDevmode As IntPtr, dwFlags As Integer,
dwDesiredAccess As Integer, lpsa As IntPtr) As IntPtr

Declare Function SetThreadDesktop Lib "user32.dll" (hDesktop As
IntPtr) As Boolean

Declare Function GetGUIThreadInfo Lib "user32.dll" (idThread As
Integer, ByRef lpgui As GUITHREADINFO) As Boolean

For CreateWindowStation and CreateDesktop, you can change the lpsa
parameter to ByRef lpsa As SECURITY_ATTRIBUTES if you actually want to
specify it (not pass NULL).

Mattias