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  These functions check for a user interrupt every 1000 lines of output.
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  These functions check for a user interrupt every 1000 lines of output.
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  If \code{file} is a non-open connection, an attempt is made to open it
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  If \code{file} is a non-open connection, an attempt is made to open it
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  and then close it after use.
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  and then close it after use.
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  To write a Unix-style file on Windows, use a binary connection
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  To write a Unix-style file on Windows, use a binary connection
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  e.g. \code{file = file("filename", "wb")}.
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  e.g. \code{file = file("filename", "wb")}.
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}
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}
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\section{CSV files}{
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\section{CSV files}{
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  By default there is no column name for a column of row names.  If
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  By default there is no column name for a column of row names.  If
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  These wrappers are deliberately inflexible: they are designed to
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  These wrappers are deliberately inflexible: they are designed to
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  ensure that the correct conventions are used to write a valid file.
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  ensure that the correct conventions are used to write a valid file.
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  Attempts to change \code{append}, \code{col.names}, \code{sep},
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  Attempts to change \code{append}, \code{col.names}, \code{sep},
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  \code{dec} or \code{qmethod} are ignored, with a warning.
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  \code{dec} or \code{qmethod} are ignored, with a warning.
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  CSV files do not record an encoding, and this causes problems if they
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  CSV files do not record an encoding, and this causes problems if they
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  are not ASCII for many other applications.  Windows Excel 2007/10 will
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  are not ASCII for many other applications.  Windows Excel 2007/10 will
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  open files (e.g. by the file association mechanism) correctly if they
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  open files (e.g. by the file association mechanism) correctly if they
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  are ASCII or UTF-16 (use \code{fileEncoding = "UTF-16LE"}) or perhaps in
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  are ASCII or UTF-16 (use \code{fileEncoding = "UTF-16LE"}) or perhaps in
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  the current Windows codepage (e.g. \code{"CP1252"}), but the
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  the current Windows codepage (e.g. \code{"CP1252"}), but the