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Four-Letter Words
There are two four-letter words that you may notice get used a
lot when talking about Zephyr. One of these, zctl, has appeared
in this document many times already, as part of the commands to change
Zephyr subscriptions, Zephyr exposure levels, and other things. The
other word, zwgc, has not been mentioned yet in this document
but is equally important. In this section, both the zwgc and
zctl programs will be introduced, so that you can better
understand how Zephyr actually works.