Getting Twitter Text Content from API Stream


Is it possible to parse out the text of incoming data stream? Plz direct me to the correct starting point. I want to develop this application in VB.Net … Show me where to start and if I will be able to get the content of the tweets. I want to subscribe to public website’s tweets.
I have read the initial development help, but I don’t understand how to test this. Step by step how do I use “OAuth Signature Generator” . I have an app already and have gone thru all the secret codes.