Downloading file from cgi application

[sophie_newbie]

Hi,

I'm writing a cgi application in Python that generates a PDF file for
the user and then allows them to download that file. Currently I'm
just writing the PDF file to the 'htdocs' directory and giving the
user a link to this file to download it. But the problem is that
another user could simply come along and download a file that isn't
their file by typing the address into the address bar. I don't want to
delete the file after it is downloaded either because I'd like the
user to be able to download it again if necessary. Is there any way
around this problem?

Thanks.