The Internet is an extremely fast-growing electronic market. Due to the num
ber of different dealers and offers it becomes more and more difficult for
clients to keep track and make the right buying decision. Electronic commer
ce applications have the potential to provide customers with targeted infor
mation and to increase the customer relationship in the sense of 1:1 market
ing strategies. This article gives an overview of the state of the art and
describes a prototype of an electronic commerce application for computer ha
rdware (http://www.Hardware.de). The so called "infobroker" consists of an
individual configurable newsletter an offer assistant and a channel. The ad
ministration and improvement of the users' profiles is partly done automati
cally by evaluating their habits and actions within the system.