what is ha, tgt, and lun

I've been looking at the source code to a cd-ripper, and I've noticed that is uses what is ha, tgt, and lun to designate the cd-rom drive to use.  What is what is ha, tgt, and lun for, and is there a way to figure out the logical driver letter from those values?
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lwinkenbAsked:
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brettmjohnsonConnect With a Mentor Commented:
'ha' is probably "host adapter" this identifies which SCSI (or pseudo-scsi) channel to use.
'tgt' is probably "target" device id.  Each device on a SCSI chain has a unique ID 0-15.
'lun' is probably "logical unit number". usually used to identify logical volumes within a physical device.

http://www.scsimasters.com/basicterms.html


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