If I develop a web app in phonegap, can the same web app be made to run in regular desktops/laptops inside a browser?
If your phonegap application doesn't depend on any native code, then yes you can simply use the html, css & js files needed to create a web application. If your phonegap app uses any phonegap plugins or phonegap specific javascript calls, then you simply need decided on how these should be implemented on a web application.