When you have a question about custom code, you will always get your fastest answer (and usually the most accurate) by asking in the author’s thread for that code. The author will be automatically notified when a new post is added to the thread and other people who are actually using the same code may also be able to help.
In this case, ask your question in the following thread ( this is a clickable link)
If you aren’t sure where the authors thread is, you will probably be able to find it by looking at the quick browse lists in the community – created wiki. In this case, you would look in the SmartApps section on that page, and then on the list for locks: