Tick by Tick data for new application

I am in Process of Developing Software for replicating Real Market in Visual Basic. What i need is tick by tick data (interval of 1/2 seconds). Once i get this data , might be able to run into program to simulate actual market for later practice. Kindly Advise Your Views/ Requirements. Awaiting Your Replies.

Thanks in Advance

People use tick data from PIB and convert it to required format. You may try spider software, the site is : spidersoftwareindia.com, in case this is wrong just google it.
I am using RT DATA provided by trendrider (www.stoxtrend.com) I use it in metastock , the data is 20 to 30 seconds delayed. 5 minute bars are formed but price gets updated every 20 to 30 secs.