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So this theme has been abandoned for a while now (12/4/13). There is a UW Madison department that has forked this theme. I can point you in the right direction if you want to use that theme.
This module is not intended to be a remote kill for a client's site. If that is what you need, take a look at killswitch.
What does Lockout do?
This module displays a generic off line page with a message indicating that the site owner should contact technical support. The idea being similar to cPanel's "suspended account" page. Additionally, this module should be used in a similar environment. For example, I build websites for clients and host these sites on my server. They pay me on a recurring basis for the hosting. If they become delinquent in payments and fail to respond to emails or calls, I use this as my last resort to get their attention.
How do I use Lockout?
While logged in as "User 1" visit the lockout settings page, Administration > Configuration > System > Lockout, tick the box and save. While set, one can still access the /user and /admin* sections. This will allows "User 1" to log in again and turn off Lockout.
Doesn't the core maintenance mode do the same thing?