#!perl -w
use Win32::Internet;
my $addr = "http://somewebaddress.com/prog.cgi?parameters";
my $INET = new Win32::Internet();
my $url = $INET->FetchURL($addr);
$INET->Close();
print $url;
... etc ...

##</code><code>##

#!perl -w
use Win32::Internet;
my $addr = "http://somewebaddress.com/prog.cgi?parameters";
while (1)
{
  my $INET = new Win32::Internet();
  my $url = $INET->FetchURL($addr);
  $INET->Close();
  print $url;
  sleep 180;
}