Reference Guide > System Variables > !D.Unit
  

!D.Unit
The logical number of the file open for output by the current graphics device. This field only has meaning if the file is accessible to the user from PV-WAVE, and is 0 if no file is open. For example, the PostScript driver maintains this field with the unit number of the file open for PostScript output. In the case of Tektronix output to a file, !D.Unit may be set to either + or – the logical unit number.

Version 2017.0
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