Information on "Make Admin Login Page Accessible Only from" setting

Information on "Make Admin Login Page Accessible Only from" setting

I am trying to find detailed information about the " Make Admin Login Page Accessible Only from" setting. I have read through the user guide, googled it, found a page or two outside of the forums but I am not closer to figuring out what this setting does and does it do what I think it does.

The way I read " Make Admin Login Page Accessible Only from" is that it locks down the admin page to only be accessed by specified IP addresses. If that is true then what is the separator used to list multiple addresses? Comma? Semicolon? If this setting is messed up or if the only system listed is decommissioned how do I reset or change this setting?
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