Absolutely nothing.
Now that you have the script loaded, when a person joins a channel (that you are also in), their nick is added to a list of nicks that have been recognized as using a specific address.
If more than one nick is recognized for the address, then you will see a message in the channel stating all of the recognized nicks for the nick that joined.
Eg: RusselB aka RusselB-afk, DJ^RusselB
This message is sent to you via the /echo command, so only you see it.
If someone changes their nick, then the new nick will also be added, but there is no message that is sent.
So the only time you will see a message from the script, is if someone joins the channel and they have been recognized as having used one or more alternative nicks.
