A read-only node is one whose properties, attributes, or child nodes cannot be changed. You can remove a read-only node from the tree and insert it somewhere else. For example, Entity nodes are always read-only.
This property is a Microsoft extension to the Document Object Model (DOM).
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2