I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 129)

How To
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To access the document separation options:
 Click the Settings menu and click Document Separation and
Indexing.
 Indicate which separation method you are going to use: Detect
blank pages or Detect cover pages with a barcode.
When you are using barcode pages as cover page, you can
indicate specific data your barcodes should contain in order for
Readiris to consider them to be barcode pages. Insert your
company name for instance, I.R.I.S. in our case, in the field
containing. Only barcodes that contain the data 'I.R.I.S.' will be
marked as cover pages and will be used to split up your
document batch into separate documents. You can also add a
variable part to the data, for instance the scanning date. This
variable part will indicate the specific indexing data of each
individual document.