calling web method from URL

[Burt]

I created a SOAP based web service which I can easily call from my
vb.net code after adding the web reference:

Dim ws As New myserver.myservice()
dim ds as ws.mymethod(sMyXMLParam)

However, our Peoplesoft guy wants to use my web service, and can only
specify a URL and the XML param to post. Is there a way to call the
method using just a URL, eg:

http://myserver/myservice/mymethod?sMyXMLParam

I created the service visually using SQLXML 3.0, so there's no asmx
file, just a wsdl file. The service updates a SQL Server 2000 table.

Many thanks for any help,

Burt