file targets

Hi,

On several forums, I have seen links of the form

http://site/download.php?id=230923

and when the link is followed, a file download follows, and the filename
will be something like reasonable-name.tar.gz or something.

Does anyone know how this is done? or if it can be done with ruby?

db

-- 
"The two aims of the Party are to conquer the whole surface of the earth
and to extinguish once and for all the possiblity of independant thought."
-- 1984, George Orwell