Chapter 28 - Anchor

Page Description
Figure 28.1 Anchor Viewpoints Dungeon A dungeon destination world. Click either anchored Cone to switch viewpoints. Anchor viewpoint DEF names are indicated by the url, similar to HTML bookmarks on a page.
Figure 28.2 Anchor Load Another World Anchor parameter/target demonstrations: click left text to load another scene in the same window, or click right text to load another scene in a new window.

http://www.web3d.org/x3d/content/examples/Vrml2.0Sourcebook/Chapter28-Anchor