The present invention relates to a method and system for client-side interacting with a server-side web application in a web-based client-server environment, in which a client-side web browser is used as a user interface for displaying web pages sent by the web application within a browser application frame and for converting events triggered by one or more user actions within said application frame into a request directed to said server-side web application, wherein an executable program object for example a Java Script is used at the client side as a part of the client-side web application user interface.In order to improve the user interface it is proposed to use an additional frame in the browser which communicates with the server and which prevents the displayed document from being reloaded when the server sends its response. Instead, only delta information (50) is displayed within the frame.