I met a problem that there are two applications. one is desktop application in c#, and another is web application in javascript. some variables or informations in running deskto
When you open the web application, pass the variables in as query string parameters and you can get them using javascript various ways, some of which are noted here
I think the processes are very well separated and unless you use a sole handler for c# + js (c#.net to render your page for instance) it is going to be impossible to retrieve data.
Maybe you can get something from the webbrowser object: running it on your page you might gain access to some of your web variables...
Also, if the c# app writes data in a file, the js could read it...
Have fun Rgds