Question re: wrapping non-WP files

Hi there,

I have a bit of an odd question (maybe not, I don’t know). But is there a way to use the WP wrapper/theme to display a non-WP page or file? I run a website that uses a home-brew php/MySQL solution to display photo updates and I’d like to use the WP system to unify the look and feel of the site. This is a full functioned script/page that has its own database, backend and display page. Is there a way to do this? Thanks for your help/advice!

P.s. Sorry if I’ve posted this in the wrong section.