do you perhaps mean the following option?
If so, this option will enable you to manually Validate PDM user accounts if you have PDM user login type set to Windows Active Directory. Previous to EPDM 2015 this was done automatically upon opening the Users node but this could take a long time when there are many users in AD. Have a look in KB article 068787 for more info.
I hope this helps, if you meant another option, please elaborate preferably with some screenshots.
Yes, many thanks, a question of it, other statement because of machine translation.