I need some one to point me to some very basic tutorial or reference or info to get me started.
I need to build a web app with sql (or some thing) data storage.
I have written several web sites using HTML, JAVA and PHP with text based data storage.
I need to be able to fire an event in that app from a LAN based program.
The event will retrieve data and send it back
I need to be able to fire an event in the LAN based program from the web based app.
The event will tell the LAN based program "here is the data you asked for".
The request and the response can be in a JSON format.

The LAN based app is written in VB5.
I have here also Visual Studio 2005 , from which I can develop an interface between the LAN and the web if that will help.

I just need to know how to start...

Thanks