1. A method of implementing application agnostic UI integration, the method comprising: receiving, by an application computer system executing a UI servlet from a source application running on a source computer system, a request to instantiate an instance of a UI provided by a target application running on a target computer system, the request including a set of parameters from the source application wherein the application computer system provides a generic architecture and framework for web based interactions between the source application and the target application and wherein the framework is configured to launch the instance of the UI provided by the target application from any source application; determining, by the application computer system, an application specific class of the target application for the instance of the UI provided by the target application; looking up, by the application computer system a class name for the application specific class of the target application for the instance of the UI provided by the target application in configuration XML of the UI servlet based on the set of parameters from the source application; using, by the application computer system, a pre-built factory class to create an object of the application specific class of the target application based on the determined application specific class and the class name; getting, by the application computer system, a URL and parameters for the created object; and integrating, by the application computer system, the instance of the UI provided by the target application into a UI of the source application by redirecting the request from the source application using the URL and parameters for the created object.