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Closing Files

	Under twenex, why does Maclisp use restricted JFNs when you
open a file? This is very annoying when it is important to close 
a file, but you don't have a handle on it.  Yes I know about IOTA, but
sometimes you don't plan ahead, and sometimes you are using someone
elses code.  Either the JFNs should be unrestricted, or there should
be a lisp functions which closes all files, or you should at least be
able to specify UNRESTRICTED as a file mode to OPEN.