I.R.I.S. Readiris Corporate 12 for Windows User Guide - Manual (Page 74)

Chapter 10 – Recognizing documents
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To use an existing font dictionary:
 On the Learn menu click Font Dictionary.
 Select the dictionary you want to use and click Open.
 On the Learn menu click either Append Font Dictionary or
Read Font Dictionary.
When selecting Append Font Dictionary, make sure to enable
Interactive Learning. Readiris will recognize the character shapes
stored in the dictionary and use interactive learning, allowing you to
store new information in the dictionary.
When selecting Read Font Dictionary, Readiris will recognize the
character shapes stored in the dictionary but will not add new content
to the dictionary, even if Interactive Learning is enabled. Note that it
is still useful to use Interactive Learning to check, and if necessary,
correct the recognition results which are not saved in the font
dictionary.
Caution: do not click Font Dictionary on the Learn menu and open
an existing dictionary while the dictionary mode New Dictionary is
enabled. Otherwise, the contents of the existing font dictionary will be
erased.
 Click Recognize + Save to recognize the document.