In Lisp, programs (also called modules) are stored in files. Each file is a sequence of Lisp forms (known as top-level forms). Most of the top-level forms in a program will be definitions (i.e. function, macro or variable definitions) since generally each module is a system of related functions and variables.
Before the program can be used it has to be loaded into the editor's workspace; this involves reading and evaluating each top-level form in the file.
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