I think that paraschopra is right in the determining whether there is an existing need for this. Though, my approach is - what's the application that this could

I think that paraschopra is right in the determining whether there is an existing need for this. Though, my approach is - what's the application that this could be really great for? Whether it exists, or is exactly on-site billing at a client -I think the answer is - where is this a killer app? Isn't there a great application for pop-up sales events? Fairs, trade shows, etc?