perl - sending an existing file to browser.

Hello All,
I did ask this some time ago but so far nothing seems  to be working, and
now I'm at the point of action where I need to know in a hurry. What I want
is to have a perl script which when accessed by a form will send one of a
number of already existing files back to the browser depending on the form
content.
I've no problem with anything except how to send an EXISTING html file,
usually I create it on the fly within the script but in this case I just
want to select an appropriate file that already exists.

I believe this can be done using the ` ` character please let me know.

Many Thanks
Peter Newton

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