Architecture:
The client side is developed in J2ME for the MIDP 1.0 profile. The client mobile handsets require GPRS capability. The server side (web service) is developed using ASP.NET and is hosted on a Microsoft IIS web server. Communication between the server and client is achieved using XML data transfer over SOAP protocol. The figure below gives you a pictorial representation of the architecture.

Lexicon Arhcitecture Diagram