They can also reference shared directories on remote hosts or files and subdirectories within shared directories: their target is not mounted immediately at boot, but only temporarily on demand while opening them with the OpenFile() or CreateFile() API.
This describes a method of accessing shared directories on remote computers where they are only made accessible when needed, rather than being permanently mounted. This is achieved by using the OpenFile() or CreateFile() API to access files and subdirectories within these shared directories.