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White, red, and yellow pages

There are a number of operating systems that will not be able to support
:APPEND to files.  Where it is clear that there will be some differences
between implementations, the white pages should mention this: "Note: not
all implementations will be able to support :APPEND."  Or some such.

In general, it is impossible for the white pages to flag all extensions
made by all current and future Common Lisp implementations, so you will
indeed have to be familiar with the red pages for your implementation.
Most of the extensions will be easy to remember, or will be things you
never want to use anyway; for the others, an obvious techniques is to
mark the passage in the white pages that are modified in the red.
I assume that Zetalisp will continue to have a separate manual, so their
very extensive supersetting will not be a problem.

-- Scott