HP Designjet T1500

HP Designjet Printer Series Security Settings
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If there is no administrator account, restricted operations can be accessed without a password.
3.4.1 Guest password
Once the administrator user account has been set, the administrator can also set the guest user account by specifying
a password for the guest.
If the guest user account is set, a username and password are required for all EWS operations: users indentified as
guests have access to restricted operations, whilst users identified as administrators have access to all operations.
If the guest account is not set, a username and password are not required for unrestricted operations.