title: how do Sencha, phonegap, or corona really work under the hood?
body: <p>how do these platforms allow one to write a single code for multiple mobile phone platforms?</p>
  
  <p>what kind of magic is going on that allows simple javascript to be used in Sencha to produce multi platform app? I am highly skeptical of all the solutions out there. Especially when they are commercial and no one really explains well what goes on under the hood.</p>