2.3. I get messages like 'Config.pm not found.' What does it mean?

This means your Perl is not properly installed, or that Interchange is not using the proper Perl binary. On UNIX, try reinstalling Interchange and using the standard Perl installation sequence:

   /complete/path/to/proper/perl Makefile.PL
   make
   make test
   make install

Otherwise, contact your system administrator.