The answer to that question is probably “no” unless we’re talking about witches who can’t write without their familiar standing by.
Nonetheless, Katy guards my den while I’m at work. From her position next to the file cabinet, she can see all the way down the hall. This way, other entities–such as my wife, guests coming in the front door, or the other three cats in the house–cannot approach without challenge.
When Katy gets bored with her duties, she squeezes in behind me on my desk chair and falls asleep–with one eye open.