<phew> got it working. Biggest help was from here:
https://forum.amiga.org/index.php?topic=73225.0
I'll post the code tomorrow after some clean-up. In essence, you go through the device list from DOSBase->dl_Root->rn_Info, look at each one with dl_Type == DLT_VOLUME to get the volume names, then pass that to another routine that goes through dvi->dvi_Type == DLT_DEVICE items, and compares dvi->dvi_Task to the dl_Task from the first function. If they match, it's the same drive/volume, and you have access to the device name (eg, DF0
and the 'driver' name (scsi.device, etc.).
I also found this little nugget, which suggests how AmigaDOS keeps them distinct:
Quote:
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To distinguish disks with the same name, AmigaDOS timestamps the volume on creation and then saves the timestamp in the list structure. AmigaDOS can therefore compare the timestamps of different volumes whenever necessary.
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https://wiki.amigaos.net/wiki/AmigaDOS_Data_Structures
So far my device name + volume name is adequate to keeping windows from various disks separate.