Developer tagging tweets


Hi Twitter Team,

I am developing an iPhone application which supports tweeting to an user account. Being a developer I would like to get the list of all tweets/users who have tweeted using my app. How can I achieve this?

I have gone through the hash tagging concept for tweets. I can hash tag the tweet with my app name and get the list of tweets that are tweeted using my app. But, here I need to force the user to hash tag the tweets. User might not want his tweet to appear with hash tag of my app name. Is there any thing like hidden hash tags that only developers know?

Thanks and Regards,