Pushing file name to browser

[pxlpluker]

I what to dynamically create a page that has download links to file
stored on disk.

the part i don't know how to do (or if its possible) is to a different
name appear in the browser DL window.

i.e. I want the files stored with a random string but when being DL to
have real name show in File Save dialog.

in essence i want to push the file name to the browser

Fred