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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: use_error
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>USE_ERROR when using the Direct_IO Package, can anyone tell me what in the
>heck this means, or where I can read up on it??? thanks....ryan =]
  LRM A.13 "Exceptions in Input-Output", paragraph 10, says
"The exception Use_Error is propagated if an operation is attempted
that is not possible for reasons that depend on characteristics of
the external file. ...".  Are you trying to read from a printer, or
write to a read-only file, or something like that?