How do I execute an ASP file from PHP?

Let me explain:

I have built a sloppy integration utility with a asp forum I am using. Needing to automate the process, I have tried inserting an execute function to the _blog_list.php file which gets called every time the Blogs are displayed in the Admin section. I don't want this process to run every time someone hits a page on the blog, so I thought a good place would be when one of the administrators performs a task (create, delete, permissions, etc). So I need to know how to execute a file called blogupdate.asp from the Blog software. Which file should I use? What is the syntax? And where to place it?

Thanks for any help!!