Alibaba.co, the world's largest business-to-business e-commerce operation  recently registered its one millionth member in India, almost doubling its membership of  just a year ago.  Indian small and medium businesses have embraced the Hangzhou (China)-headquartered  e-comm leader  and now account for  12 percent  of all registered users. This has seen  an opening up of Indo-China trade -- though Indian companies have been leveraging the portal for trade the world over.