Everything you buy, you have to support -- or hire someone else to support. That's the problem with buying and deploying lots of stuff: it all needs attention. To make your support dollars effective, there are a number of things that you need to know. For example, you must know all that you have in your infrastructure: laptops, desktops, servers, PDAs, minicomputers, mainframes, communications networks, routers, switches, business applications, and messaging applications.