The location in the pathname space where a resource manager has "registered" itself. For example, the serial port resource manager registers mountpoints for each serial device (/dev/ser1, /dev/ser2, etc.), and a CD-ROM filesystem may register a single mountpoint of /cdrom.

a unique reference for a stream, which is needed if icecast is handling more than one stream at the same time

a page which - for the next level - points to another page