I'm not sure where to post this question, so for now, I'll stick it here. Ok, here's the deal...

I have an application written as an Excel VBA add-in. It generates information that I need to upload to my site. I will, at minimum, include the ability to go the site, hit the upload button, select the file from your HD, and submit. I would also like the ability to submit the file from within the Excel add-in.

In other words, how would I go about having a stand-alone, client application mimic the functionality of the normal html/javascript/php upload mechanism?