Editing Reduce (computer algebra system) (section)

=== Loading packages ===
REDUCE is composed of a number of packages; some are pre-loaded, some are auto-loaded when needed, and some must be explicitly loaded before they can be used. The command
 <code>load_package</code> ''package1''<code>,</code> ''package2''<code>,</code> ...
loads each of the named packages in succession into REDUCE. Package names are ''not'' filenames; they are simple identifiers that do not need any exclamation marks, so they are normally input as identifiers, although they can be input as strings. A package consists of one or more files of compiled Lisp code, and the <code>load_package</code> command ensures that the right files are loaded in the right order. The precise filenames and locations depend on the version of Lisp on which REDUCE is built, but the package names are always the same.