Help with remote posting

I need a little help figuring out how to post to my site remotely. I’m using WP 2.9.1 as a CMS for my company and one of the things they want to happen is to autopost a blog entry to our site with some content from one of our databases whenever we make a big sale. The idea being that our internal process will fire off the information in a pipe delimited file and send it to WordPress as a blog post.

After doing some research, I see where I can use XMLRPC to do what I need, but I’ve got no idea how to implement it. I have found sample code online that show how to setup an xmlrpc function, but that is where they all stop.

I need to know where I need to put that code. Should it be a seperate .php file? I also need to know how to call that function. To start with, I want to just test the function itself, so should I create a html file with a submit button?

I’m feeling a little lost at the moment and any help is appreciated. Even if its just links to other resources that will help me learn my way around this mess.