Agilent Technologies 93000 SOC Series Training Manual page 625

System File Examples
Device In Use File
A temporary file (.device_inuse_soc) is created under the user's home
directory while running SmarTest that points to the current device in
use.
When the SmarTest software is started, the device listed in the
.device_inuse_soc file will be opened.
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Agilent 93000 SOC Series User Training Part 1, October 2004