HowInstall.txt

Required Bins : Minimal required assemblies to work with NHibernate


Required for LazyLoading : 
NHibernate 2.1 has a new important feature regarding dynamic-proxy systems for lazy-loading
Details are available in releasenotes.txt and in this post
https://nhibernate.info/blog/2008/11/09/nh2-1-0-bytecode-providers.html