Users relationship between Creator and AppCreator

Users relationship between Creator and AppCreator

I have an application I'm building for a client, there is a back-office administration web application built in Creator and then a mobile app built in AppCreator where field agents collect & view data stored in Creator.

I want to store the user who added the record in Creator but the field agents won't have access to the backoffice application.

Both Creator and AppCreator have the option to invite users but do I have to invite from both? I'm concerned about the logisitics of having to invite users to both applications. How does this stuff work?

Best Regards,
Gavin