[Zope] How to set the login prompt?

(This is on Zserver standalone.) I'm using the LDAPAdapter product to do authentication in a particular folder in my tree. (I'm using EtcUser above, for a different purpose.) I'd like to change the prompt that's offered to the users when they're challenged for a password. IIRC, right now it says "Enter Password for Zope". I think this is the http realm, right? Can I change it in the context of my subfolder? (Without changing it for the entire server?)