#include <windows.h>
#include <stdio.h>

HDESK   hdeskCurrent;
HDESK   hdesk;
HWINSTA hwinstaCurrent;
HWINSTA hwinsta;

BOOL Attach(LPCTSTR szWinSta)
{
      // 
      // Save the current Window station
      // 
      hwinstaCurrent = GetProcessWindowStation();
      if (hwinstaCurrent == NULL)
         return FALSE;

      // 
      // Save the current desktop
      // 
      hdeskCurrent = GetThreadDesktop(GetCurrentThreadId());
      if (hdeskCurrent == NULL)
         return FALSE;

      // 
      // Obtain a handle to WinSta0 - service must be running
      // in the LocalSystem account
      // 
      hwinsta = OpenWindowStation(szWinSta, FALSE,
                                  WINSTA_ACCESSCLIPBOARD   |
                                  WINSTA_ACCESSGLOBALATOMS |
                                  WINSTA_CREATEDESKTOP     |
                                  WINSTA_ENUMDESKTOPS      |
                                  WINSTA_ENUMERATE         |
                                  WINSTA_EXITWINDOWS       |
                                  WINSTA_READATTRIBUTES    |
                                  WINSTA_READSCREEN        |
                                  WINSTA_WRITEATTRIBUTES);
      if (hwinsta == NULL)
         return FALSE;

      // 
      // Set the windowstation to be winsta0
      // 
      if (!SetProcessWindowStation(hwinsta))
         return FALSE;

	  // 
      // Get the default desktop on winsta0
      // 
      hdesk = OpenDesktop("default", 0, FALSE,
                            DESKTOP_CREATEMENU |
                  DESKTOP_CREATEWINDOW |
                            DESKTOP_ENUMERATE    |
                            DESKTOP_HOOKCONTROL  |
                            DESKTOP_JOURNALPLAYBACK |
                            DESKTOP_JOURNALRECORD |
                            DESKTOP_READOBJECTS |
                            DESKTOP_SWITCHDESKTOP |
                            DESKTOP_WRITEOBJECTS);

	  printf("%d %d\n", hdesk, GetLastError());

	  SetThreadDesktop(hdesk);


	return TRUE;
}

BOOL Detach()
{
	// 
   // Reset the Window station and desktop
   // 
   if (!SetProcessWindowStation(hwinstaCurrent))
           return FALSE;

   if (!SetThreadDesktop(hdeskCurrent))
      return FALSE;

   // 
   // Close the windowstation and desktop handles
   // 
   if (!CloseWindowStation(hwinsta))
      return FALSE;

   if (!CloseDesktop(hdesk))
           return FALSE;

   return TRUE;
}

int main()
{
    if(Attach("WinSta0"))
    {
	// do stuff here	
	Detach();
    }
}