You can use Flash to write values to a database (or even a txt document) and set up the Flash interface to pull those entries back out of the database, but I don’t know how much luck you’ll have trying to get the functionality you are looking for with PDFs. Getting Flash to access other files on the user’s system (especially functionality like opening, modifying and saving files) is trickier than you might think.
Flash content on a CDROM can access the hard drive/file system and even open files, but saving them and recalling them etc. is quite a challenge. There is a program called Zinc that enables many more file system features within Flash, but it’s pricey and has a learning curve.
Your best bet might be looking into FlashPaper, which was essentially Macromedia’s answer to PDFs before the Adobe acquisition. FlashPaper integrates much more seamlessly into Flash, although you may still have issues calling up docs, saving them and recalling them. For security reasons Flash doesn’t do this type of thing super easily, without the aforementioned Zinc app.
Brendan Coots
Splitvision Digital
http://www.splitvisiondigital.com