Content Expiration Notification - How does it work?

[organised]

According to the Adobe advertising, the new content expiration notification feature will:

"Set the expiration value for a single Contribute page or multiple pages, and Contribute will notify the designated content contributors when the expiration date nears".

Can anyone please enlighten me as to how this feature works?

I have managed to locate how Administrators can view and manage page expiry, as well as how Administrators can manually send emails to contributors when a page is due to expire.

However, I have been unable to locate the feature whereby Contribute itself notifies contributors when the "expiration date nears". How does it do this? Does it mark the page? Does it send an email? Does it show up when Contribute is launched by the contributor?

Thanks for any help.