Yes, Unity with Notes does support PCA (Personal Communicaitons Assistant - this is a super set of the Active Assistant pages). The administration guide has a full chapter on how to setup access to the client applicaitons including PCA. You'll find the administration guide for Notes for Unity 4.0(2) here:
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.