This wildcard will be replaced with the clients operating system (the client which is connected to the browser).
The available values for this wildcard are:
Linux
Mac OS X
Windows 10
This value will be shown as well on Win 11 hosts
Windows NT
This value is dedicated to Windows Server OS hosts
Unix
This wildcard tells you the operating system of your client, accessing the Helmut4 website, the operating system of your job/stream might be another - consider to have a look into this wildcard local OS