Modifying a User in the Security Database Using the Services API
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You can create a new user in the InterBase security database (admin.ib by default) using the cluster identifier isc_action_svc_modify_user.
The arguments you can use in this cluster are the same as those you can use with isc_action_svc_add_user. You cannot change a user name, only associated properties of that user entry. Only properties you specify change. To remove a property, specify zero for the length and data of the property. The first argument in the cluster must be isc_spb_sec_username.