Sentence:  Whether you already consider yourself a 1-2-3 <WSD>power user</WSD> or would like to become one, the fact that you have picked up this book probably qualifies you as a person who will benefit from a guide to the real power of 1-2-3. 
Meaning of the word marked with <WSD> tags:  A person who makes heavy use of computers, running many applications and capable of using advanced functionality.