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$D. Device Checking Default: $D+
{$D.}
Checks text files opened by Reset, Rewrite, or Append, to see if they
are devices. If a text file is a device, then buffering is disabled
for the file. This directive is usually used in combination with the
$P and $G directives.
$D+ Performs device check. if device, no buffering is
used.
$D- Does not check for device. All I/O is buffered.
Range: Entire program.
See Also:
$P±
$G±
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