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Wait! Before we get started, let's do something to make sure we actually finish.
I realize that as a system administrator (SA), you are flooded with constant interruptions. The phone rings, a customer![*] stops by with questions, your email reader beeps with the arrival of a new message, and someone on Instant Messenger (IM) is trying to raise your attention. Heck, I bet someone's interrupted you while reading this paragraph.
[*] In this book, I will use the term "customer" to denote any internal or external user of your computers, network, applications, and so on. I prefer "customer" over "user" because it better represents the relationship SAs should have with the people they serve.