This is Perl module B::Iterator. INSTALLATION B::Iterator installation is straightforward. If your CPAN shell is set up, you should just be able to do $ cpan B::Iterator Download it, unpack it, then build it as per the usual: $ perl Makefile.PL $ make && make test Then install it: $ make install DOCUMENTATION B::Iterator documentation is available as in POD. So you can do: $ perldoc B::Iterator to read the documentation online with your favorite pager. Goro Fuji