Two extra layers of administration have been added to manage the display-buffer and buffer-snip connections. A buffer never communicates directly with a display; instead, it always communicates with a buffer administrator, an instance of the wx:media-admin% class, which relays information to the display. Similarly, a snip communicates with a snip administrator, an instance of the wx:snip-admin% class.
The administrative layers make the editor hierarchy flexible without adding redundant complexity. For example, a buffer can be a single item within another buffer. Without administrators, the basic buffer class would also have to contain all the functionality of a display (for the containing buffer) and a snip (for the embedded buffer). Using administrators, the same buffer class can serve as both the containing and embedded buffer and provide special administrators for the embedded buffer.
A snip belong to at most one buffer via a single administrator. A buffer can only have one administrator as well. However, the administrator that connects the a buffer to the standard view can work with other such administrators. In particular, the administrator of a wx:media-canvas% can work with other wx:media-canvas% administrators, so a buffer can be displayed in multiple wx:media-canvas% views at the same time.