Only sample scrips with current day's data are available for free demo with limited features. But paid subscribers can get more scrips in real time chart with three months historical intraday data and they can save their custom studies, settings and preferences.
I dont think free demo for RT chart is available........I just checked in where they have listed nifty and nifty features on their RT chart but corresponding chart is not being displayed...
Pramodvarmag is the representative of Investbulls.com
obviously, the best person to answer all your queries...