asp/php communication to local service/application

[524happy]

I have a local application which parses data. What i need is to develop a web interface to query statistics and set configurations for the application thats running at all times. Since I am the developer of both applications I have full access to both source. My main goals here are:- have a service or app running at all times on the webserver doing most of the work- have a webUI which will connect to this app and display stats and make configurations- service/app will be writen in C#- WebUI will be written in asp or php- the WebUI must be accessable through the web domain ie: http://server/TestApp on default port 80 were there are other web apps running already.I know there are ways to do this using a specific port to communicate to eachother, but i would like to avoid this. What is the best way to communicate between these apps?Thanks,-Stewart