Proxy configuration - tool for identifying what proxy is being use

Hello,

We have decided to use a proxy server. We followed all documentation that we
could find on using wpad.dat on a webserver. This seems to work for client
that have the Automatic Detect Proxy box checked in IE. We are setting up two
proxies for redunancy, but want to see which one the client is using. Is
there a tool or command that can give you the name of the proxy server that
IE is currently using??