In this paper we are presenting the internet based data acquisition system which will be comparatively low in cost and can be flexible to serve for different applications by connecting different modules. Key module in the system is embedded board which communicates via GPRS which eases it’s accessibility from any place in the world through a web server built into the board. Using FTP server rem...

A geographically distributed web server (GDWS) system consists of multiple server nodes interconnected by a metropolitan area network (MAN) or a wide area network (WAN). It can achieve better eÆciency in handling ever-increasing web requests than centralized web servers because its throughput will not be limited by available bandwidth connecting to a central server. The key research issue in th...

A popular technique to improve the scalability of a web based system is caching at proxy servers. Caching has the drawback that a cached page becomes stale when the page is updated at the web server. In some cases, staleness may not be completely avoided because the server may not wish to expend the processing and communication resources required to transmit all the updates immediately. In gene...