If th ecomputer you're working with has some server software
running (Apache or IIS) you could save your data with php or asp.
If you don't then you could use the Shared Objects (which works as
a cookie, so you'll be e bit limited here). There was a function
called MMSAVE back in FlashMX, don't know it that still works, that
writes to a text file (but only in the development enviroment).
Let me know a few more details and we'll find a way.