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