Q. Can I install two copies of AuthentiX on two different sub-webs under IIS4 (and above)?
At its core AuthentiX is an ISAPI filter, which needs to be installed at the machine level (not on a sub-web or the default web). Only one copy of the software can be installed on one machine. The administration of AuthentiX (Standard) applies to the whole machine, and if a person has access to the remote administration module, they will be able to modify access restrictions for all directories.
AuthentiX ISP separates the administration and access protection by
web-hosted IP address, and each administrator only has control of access
protection for their own IP address, and cannot protect directories that
are requested via other IP addresses on the same machine
(unless each ip address has a virtual directory that points
to the same single physical directory in which case they can).