what is commissioning button?

what i s commissioning Button means ?
what is fuction? when it use? how to use?

check pg. 91 of this manual:
ftp1.digi.com/support/documentation/90000976_W.pdf

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thankyou//////////////////////

New link for anyone who happens upon this question.

http://www.digi.com/resources/documentation/DigiDocs/90002002/default.htm