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The call to the web service would be a URL call like:
Wasn't Yahoo you were doing was it?
It's on [developer.yahoo.com...] somewhere but the site seems to be down at the moment.
my $agent = LWP::UserAgent->new(env_proxy => 1,keep_alive => 1, timeout => 30);
my $url = "http://www.theCallingSiteUrl.com/webservice?param1=t1¶m2=t2";
my $header = HTTP::Request->new(GET => $url);
my $request = HTTP::Request->new('GET', $url, $header);
my $response = $agent->request($request);
[do something with] $response->content;