This is an interactive shell for Perl, commonly known as a REPL - Read, Evaluate, Print, Loop. The shell provides for rapid development or testing of code without the need to create a temporary source code file. Through a plugin system, many features are available on demand. You can also tailor the environment through the use of profiles and run control files, for example to pre-load certain Perl modules when working on a particular project. WWW: http://search.cpan.org/dist/Devel-REPL/