https://meta.serverfault.com/questions/1760/server-fault-is-for-system-administrators-in-a-professional-capacity


I listed this question as "also related" since it contains an answer (by sysadmin1138 :) that links to a bunch of other answers.  I also feel the discussion in his answer and Womble's answer are pretty much the canonical definition of "in a professional capacity around here -- We might just want to change the title and use this as our definitive link.