Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
Diese Methode funktioniert nur auf Windows NT/2000/XP 
}

 { 
Works only on Windows NT/2000/XP systems 
}

 function TimedShutDown(Computer: string; Msg: string; Time: Word; Force: Boolean; Reboot: Boolean): Boolean;
 var
   rl: Cardinal;
   hToken: Cardinal;
   tkp: TOKEN_PRIVILEGES;
 begin
   //get user privileges to shutdown the machine, we are talking about win nt and 2k here 
  if not OpenProcessToken(GetCurrentProcess, TOKEN_ADJUST_PRIVILEGES or TOKEN_QUERY, hToken) then
     ShowMessage('Cannot open process token.')
   else
   begin
     if LookupPrivilegeValue(nil, 'SeShutdownPrivilege', tkp.Privileges[0].Luid) then
     begin
       tkp.Privileges[0].Attributes := SE_PRIVILEGE_ENABLED;
       tkp.PrivilegeCount := 1;
       AdjustTokenPrivileges(hToken, False, tkp, 0, nil, rl);
       if GetLastError <> ERROR_SUCCESS then
        ShowMessage('Error adjusting process privileges.');
     end
   else
     ShowMessage('Cannot find privilege value.');
   end;

   Result := InitiateSystemShutdown(PChar(Computer), PChar(Msg), Time, Force, Reboot)
 end;

 //Start shut down 
procedure TForm1.Button1Click(Sender: TObject);
 begin
   if not TimedShutDown('\\computername', 'you have to shutdown', 30, true, true) then
     ShowMessage('function failed...');
 end;

 //Abort shut down 
procedure TForm1.Button2Click(Sender: TObject);
 begin
   AbortSystemShutdown('\\computername');
 end;