Don't need a separate PC, just use a web site. Bit like my plugins can download the latest version.
But this would in effect be a push to pull effect.
ie you push the site details to a storage area, be it a PC or website somewhere. The a program/plugin/service on the carpc then pulls that information when the car is turned on.
Or if the car is already on, somebody can push the button and send the website to you. The program/plugin/service would then have to poll the data storageat reguialr occasions.
This is all fairly easy to do.