Retreiving Data for XHTML/CSS web page

[Talmage]

How can I easily retreive data from another file on my site to incorporate into my webpages? I guess an example might be to have a date stored somewhere in a file on my site with the last time I updated the page, which can then be read and printed at the bottom of every page on my site, saving me the effort of having to manually go to every site and change the text every time I update. I currently use XHTML and CSS.

Thanks.

[Rincewind]

Using a php or asp script. The exact details depends on what data you need to read in.