We are developing an extjs 4 web application for desktop which mainly contains charts and a simple form. Our client had asked us to analyse if this renders properly without a separate IPAD2 application.

we are exploring the feasibility of by applying responsive design principles using HTML5 media queries in EXTJS4.

a) Any thoughts on this feasibility using EXTJS 4
b) is it possible to apply any framework for any touch events by using EXTJS4 like above.
c) Do we need to use Sencha touch only for both desktop and IPAD2 applications.

thanks in advance