Yes, I understand why you've implemented authentication and it's necessary if your copy of Library server is open to the internet or accessible by people who may not have the best intentions. However, it is overkill for a closed system that is only accessed by a small number of trustworthy people!
Webremote works if you access it through a standard browser, you just have to go through a clunky dialogue box. I am trying to use a reasonably integrated remote system which displays a web page as a button on a screen. This does not go through the security credentials dialogue box, just refuses to display the page, which is why I asked if it was possible to append the credentials to a URL.
Until now it has worked very well, it's the most usable remote system that I've found.
I'll just have to VNC into the server and enable authentication if I want to do any client side tagging.