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A Lisp function becomes a command when its body contains, at top
level, a form that calls the special form
form does nothing when actually executed, but its presence serves as a
flag to indicate that interactive calling is permitted. Its argument
controls the reading of arguments for an interactive call.
General rules for
21.2.2 Code Characters for
The standard letter-codes for reading arguments in various ways. 21.2.3 Examples of Using
Examples of how to read interactive arguments.
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