InterSystems IRIS Data Platform 2019.2  /  ObjectScript Reference

ObjectScript Reference
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Contains user-specified device status information.
$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:
By default, $DEVICE contains the null string.
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Content Date/Time: 2019-08-16 05:50:13