methodID2 :: DISPID
          -> [VarIn]
          -> ArgOut a1 -> ArgOut a2
          -> IDispatch i
          -> IO (a1,a2)
methodID2 dispid args (varin1,argres1) (varin2,argres2) obj = do
   p <- obj # invokeMethod dispid args [varin1,varin2]
   unmarshallVariants2 argres1 argres2 p
methodID2 :: DISPID
          -> [VarIn]
          -> ArgOut a1 -> ArgOut a2
          -> IDispatch i
          -> IO (a1,a2)
methodID2 dispid args (varin1,argres1) (varin2,argres2) obj = do
   p <- obj # invokeMethod dispid args [varin1,varin2]
   unmarshallVariants2 argres1 argres2 p
methodID2 dispid args (varin1,argres1) (varin2,argres2) obj = do
   p <- obj # invokeMethod dispid args [varin1,varin2]
   unmarshallVariants2 argres1 argres2 p