Previously we talked about the dangers of heat in a computer system. The dust buildup is what causes much of the heat disbursement issues, but another aspect to keep in mind is proper cable management.
Some systems are constructed and designed better than others. The internal components of a computer system (be it desktop or laptop) generate lots of heat while they operate, and to combat the heat issue, engineers develop ways to increase air flow. Through the use of fans and other heat dispersal systems, such as heat-sinks (metal components used to draw heat away from main internal components), air is moved around the system, helping keep it cool.