The Secondary User Authentication Parameter

Secondary user authentication provides a method for additional identification of users that log in to the Client computer (in case any users share the same credentials).

If the Enable secondary user authentication on login checkbox is selected (on the Editing Client / Editing Client Group page, on the Authentication Options tab, scroll down to the Two-factor and Secondary Authentication section) to enable this option, the Client will display a secondary authentication window on user login to Windows.

NOTE: Secondary user authentication can only be enabled by editing Clients in the Management Tool.