Your ProStocks Trading Code is your login ID for Back Office as well as Trading Application but password for both the applications are different. As per SEBI guidelines, your trading account should have multi-level password security. You can login to back office from inside trading application by clicking on back office link without login name and password (Single sign on) in case you are using ProStocks Desktop or web trading application. Login to back office from BSE BEST trading application or ProStocks Mobile application is not possible.