Is there a way to store data in the same way as pages, but not appear as a page?

[desbest]

Is there a way to store data in the same way as pages, but not appear as a page?

I would like to store private messages using Processwire and the $page and $pages API provides a good way to do so. I know I can stop the fields inside pages from being visible in the admin panel, but is there a way to not have the page be seen in the Pages section, similar to how the Form Builder stores the entries to the forms without that being stored in the Pages section?

[abdus]

Why not store them under admin? It will be out of your sight and users without superuser permission will not be able to see the pages under admin. Thats how PW stores repeater items, too.