The Bombay Stock Exchange and the National Stock Exchange will hold special trading for about two hours today. The pre-open trade would start at 11 am and close at 11:15 am while normal trading session would happen between 11:15 am and 12:45 pm for both the bourses.BSE is holding this special live trading session to test its disaster recovery software.Trading will be held in the Securities Lending and Borrowing Scheme – SLB, derivatives and cash segments. Meanwhile, NSE will conduct the session in capital market, future and options and SLB segments.