when to use SOAP

We have recently begun using SOAP to create web services with perl and are
considering using it again for a new application which requires server to
server communication.  Since the new application is not actually going to be
a web service which will be accessed from multiple clients,  I am wondering
if it is the best option.

Given the choice between using SOAP to have a client script on box 1 call a
routine on box 2 OR to have box 1 act as a proxy server and just pass on a
request to box 2 what would be the best option and why.  The only reason we
are using two boxes is so that the services on box 2 are not directly
accessible from a browser.  The application is not intended to be a web
service called by multiple clients.

My knowledge of both SOAP and proxy is limited, so I appreciate any input
from more experienced sources.

-Diane

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