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$DEVICE
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Contains user-specified device status information.
Synopsis
$DEVICE
$D  
Description
$DEVICE can be used to record device status information. You can use the SET command to place a value in $DEVICE. By convention, this value should describe the outcome of an I/O operation as a 3-piece string, in the form:
standard_error,user_error,explanatory_text
By default, $DEVICE contains the null string.
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Content Date/Time: 2019-04-10 14:45:57