What you'll want to do is use a filename that's generated uniquely
for each user. There are lots of ways for generating a unique key
and we don't need to go into that here.
So generate the key, save the data in a filename that's constructed
from the key and pass the key to the user. Use a cookie, or a hidden
form element, or something.
Later, when you need to get the data back, use the key that's hidden
in the form or from the cookie.
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