Question about Authentication on item-level

If you set authentication for a page item, am I correct in assuming that it does get processed (i.e. the value in the item can be used for example in the where-clause in a query), but it just does not get displayed?

i mean a normal item on a page. For example a selectlist, or textfield.
In the app I'm currently developing, I have a few user levels. Normal users should only see their own records in a report, admins should be able to see all records.
So what I have for the admins, is a select-list with the usernames, so they can choose whose records they can see. A normal user can't see the select-list.
When a user logs in, I set the value of the select-list to their user-id (and the select-list displays the corresponding name, based on a LOV). The query which displays the report looks at the select-list to see for which user it must show records. So, when an admin selects a different username, it will show the records for that user. When a normal user logs in, he/she won't see the select-list, but the query does use the value of that select-list in the query.
Now what I want to know for sure, is that the select-list is always processed upon loading, and not that it's just a coincidence in this case that it's working.
I'm asking because if you check the help for the Authorization-option in the item, it says "Optionally select an authorization scheme which must evaluate to TRUE in order for this component to be rendered or otherwise processed."
From this I would think that it won't contain a value if the authorization is false (which would be in the case of a normal user).
I'm using HTML DB 1.6, by the way.

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