Need help with sending HTTP strings from Access VBA.

Can someone point me to some good instructions on using the
WinInet.dll functions from VBA?

I need to interact with a MySQL database via HTTP strings.
We already have the database set up and a PHP script that can receive
commands via HTTP. The script receives the HTTP commands and performs
the database actions, then responds with XML.

This system already works when I test it from IE. I simply send it an
HTTP string similar to this:

http://www.myweb.com/tblAdvisories.php?username=UserNameHere&password=PwdHere&query=SELECT%20%2A%20FROM%20tblAdvisories%20WHERE%20contact_id%20%3D%2012

The PHP script executes the query and sends back the results in XML. I
just need to know how to set up the VBA code to send the requests. I
think I must use WinInet functions to do this. Am I correct, or is
there a simpler way to do it, perhaps using ADO?

More info is available if needed.
.