Thinfinity VirtualUI allows you to integrate your own custom authentication method. In order to do this, use the Thinfinity VirtualUI Authentication API.
The External DLL authentication method can be added in the 'Authentication' tab of the Thinfinity VirtualUI Server Manager. Toggle its availability as an authentication method by checking or unchecking it.
When you add an External DLL authentication method you will be required to reference the .dll in the 'External DLL' option. Check the complete reference in the External DLL Authentication Method Settings.
The user definition is completed through the mapping between the user ID returned by the external DLL and an Active Directory Objects mapped for this Authentication ID Mask.