Source ID: Auto-filled and cannot be changed: this is the unique database ID for the tag's source.
DS Param1: Auto-filled and cannot be changed: this is the unique database ID for this tag within the source.
Snap Index: Auto-filled and cannot be changed: this is the tag's byte array position in the snap or current value file for that source.
Tag Id: Auto-filled and cannot be changed: this is the unique database ID for this tag.