yes,you can.
yes,you can.
yes,it is possible.In [ebook5.net],[ID/PWD] Authentification function can be attached to the book created.
yes,you can.Audience analysis can be done through the administration screen of your Google Analytics.
SubDomain is a smaller part of a larger domain.
For Example:www.ebook5.net, is a subdomain of the domain ebook5.net.