0 - Disables this setting.
If you are using LDAP this allows authentification from the secondary adressbook.
Setting this variabel to 0 Prevents LDAP authentication from working in any secondary Address Books. This also effects the Schedule Manager! The SchedMgr tasks will use this parameter/setting to decide if it should do more exhaustive lookups when validating users. Since the mail users will have to be in a trusted Directory Assistance for the mail server to authenticate them, turning on INet_Authenticate_With_Secondary=1 in the mail server's Notes.ini will allow SchedMgr to do a more exhaustive lookup and validation.
This table displays the Domino settings used by Quickplace 2.x with Domino/LDAP service or just the Domino NAB.