It won't even catch the most ridiculous abuse. If I want to spend eight billable hours reading Hacker News I'll do it on a different computer, and just make sur

It won't even catch the most ridiculous abuse. If I want to spend eight billable hours reading Hacker News I'll do it on a different computer, and just make sure my "work" machine periodically scrolls, switches file or opens up a new dialog. Might catch out somebody who deals with a couple of interruptions though...