setting header() for csv file

Hi, all -- I have a collection of files on disk which each contain a serialized array. I currently loop through those and parse them to display the values in a table, and now my client would like to additionally be able to download the data in CSV format. It's no big deal to change how I print the data, and in fact I now have a very CSV-looking web page, but I realized as I was starting to switch that I didn't know how to set the header so that it's recognized as a CSV stream with some given filename. Unfortunately, I haven't yet found my answer. How do I construct the headers so that the browser says "Oh, this is a CSV file, and here is its name; where shall I save it?" and the user doesn't have to jump through any hoops? TIA & HAND :-D -- David T-G * There is too much animal courage in (play) davidtg@justpickone.org * society and not sufficient moral courage. (work) davidtgwork@justpickone.org -- Mary Baker Eddy, "Science and Health" http://justpickone.org/davidtg/ Shpx gur Pbzzhavpngvbaf Qrprapl Npg!