Hide parameter from URL

Hello InsiteFX
Thank you for your intervention
I have seen some apps' codes built on CI an I guessed those query strings are managed internally as properties
Is it possible?
That is what I mean as "Codeigniter (or PHP MVC framework in general) technique"
Or I can turn the question this way, In your development, for the purpose above, do you make use of
- some Codeigniter utilities
- sessions
- htaccess as you linked
?

Or more simply your query string is visible and managed as in a classic PHP app (not MVC)

Thank you