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+
+@defun random n
+
+
+@defunx random n state
+Accepts a positive integer or real @var{n} and returns a number of the
+same type between zero (inclusive) and @var{n} (exclusive).  The values
+returned by @code{random} are uniformly distributed from 0 to @var{n}.
+
+The optional argument @var{state} must be of the type returned by
+@code{(seed->random-state)} or @code{(make-random-state)}.  It defaults
+to the value of the variable @code{*random-state*}.  This object is used
+to maintain the state of the pseudo-random-number generator and is
+altered as a side effect of calls to @code{random}.
+@end defun
+@defvar *random-state*
+Holds a data structure that encodes the internal state of the
+random-number generator that @code{random} uses by default.  The nature
+of this data structure is implementation-dependent.  It may be printed
+out and successfully read back in, but may or may not function correctly
+as a random-number state object in another implementation.
+@end defvar
+
+
+@defun copy-random-state state
+
+Returns a new copy of argument @var{state}.
+
+
+@defunx copy-random-state
+Returns a new copy of @code{*random-state*}.
+@end defun
+
+@defun seed->random-state seed
+
+Returns a new object of type suitable for use as the value of the
+variable @code{*random-state*} or as a second argument to @code{random}.
+The number or string @var{seed} is used to initialize the state.  If
+@code{seed->random-state} is called twice with arguments which are
+@code{equal?}, then the returned data structures will be @code{equal?}.
+Calling @code{seed->random-state} with unequal arguments will nearly
+always return unequal states.
+@end defun
+
+@defun make-random-state
+
+
+@defunx make-random-state obj
+Returns a new object of type suitable for use as the value of the
+variable @code{*random-state*} or as a second argument to @code{random}.
+If the optional argument @var{obj} is given, it should be a printable
+Scheme object; the first 50 characters of its printed representation
+will be used as the seed.  Otherwise the value of @code{*random-state*}
+is used as the seed.
+@end defun