When I first started getting paid for IT support with real money, instead of muffins, dinner, and the thanks of friends and family, I had to support a large number of computers running Windows 3.11 that were connected to a university Banyan network. One of the biggest challenges of this job was that the network card drivers had to be loaded using either the autoexec.bat or config.sys files, and that there were 15 different network card models in use for the machines I supported.