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Like root and ncadmin, user www is a built-in system user on the NetManager.
User www's home area contains the system intranet (more technically, it is the default DOCUMENT_ROOT). Therefore webpages can be added simply by putting them into www's home area (a.k.a. the webspace) by FTP, scp or Windows file sharing.
The webspace is shared as a hidden share Intranet. This is only accessible by root (or by administrator if the NetManager is a member of an Active Directory domain).