Of all the new technologies available today, the client server is very likely to have the highest impact. This is because the client server is a paradigm, a way of doing things, and not just a new "technology." Paradigms tend to have more impact, because they affect what goes on around them and generally enable new businesses or strategies and disable - or eliminate - old ones.
However, paradigms can also be confusing. There is no exact definition of "client server" or universal agreement on using the phrase at all. (Concepts like "distributed computing" or "network computing" have just as much validity. Many professionals draw distinctions between these concepts, but again, there is no universal agreement.)