Vlingo Question

I've seen the videos of Vlingo and it seems great, but everything I've seen so far is performing a function from the home screen. What about if you are already in the texting program reading a text and want to respond to the person? Can you launch Vlingo from within the application itself to respond to a text message or do you have to get out of the program and then launch the Vlingo application to answer somebody? I'm hoping it's integrated within the texting program so you can stay in it and not have to go back and forth. Same thing goes for if you are already in the email program.

Anybody know the answer to this? Thanks!!