Iterator Example

        my $it = make_iterator("access_log", "Lynx");

        $line = $it->();    # Get next line

        # Look for just the first line that has some property
        while (defined($line = $it->())) {
          print $line, last if $line =~ /LOD/;
        }

Construct many iterators that all operate independently.
Pass iterators to functions, store in data structures.
When done, throw away the object; the file will close automatically.