for symbol in symbols:  # where symbols is an iterable with the 200 symbols ...

    cerebro = bt.Cerebro()
    data = bt.fees.MyFeed(symbol)
    cerebro.adddata(data)

    results = cerebro.run()
    # do something with the results

The idea behind opening multiple cmd windows and running the strategy for each security was so that the constant live feed that is output by the logdata, notify_data, notify_order, notify_trade etc.