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[no subject]

Clearly Lisp must offer some way for the user to find out what the
status of his disk files is, so that he can close them.
There should be a function which prints out a description of
which channels have which files open, and another which allows
the user to close specific channel numbers.  Or maybe the first
one should, after printing the list, ask about each file whether
to close it.  A simpler alternative might be to return a list of
the open file-objects (dug up from a non-GC'd variable inside Lisp)
but that has the problem of making lost objects be pointed to again,
so you might not like it.  Also, the former is more likely to be
used, actually, by not-so-experienced people, so I prefer it.

It is important to do something.