Konica Minolta bizhub C754 - Manual (Page 47)

Loading with a Device Whose Authentication Settings Have Been Configured 8
TWAIN driver 8-4
8.3 Devices That Use a Middle Authentication Server
When you connect to a device that uses a middle authentication server, the
"Custom Login" dialog box appears before the main window.
Enter the predetermined user name and password.
For details, consult your system administrator.
% The dialog box shown is an example. The actual dialog box for middle
authentication may vary depending on the authentication application.