An anchor node can be activated only by setting the activate field to true (no geometry picking supported yet).
The behavior then depends of the first item of url field:
MFString url "" :
The first item of the url field can be either:
Warning:
To link a sub-scene, use M4M files in URL.
Don't use WRL files ( cause problems during the
final M4M file creation).
MFString parameter "" :
If this field contains "self", only the Inline part containing this Anchor is replaced.
SFBool activate FALSE :
Anchor will be activated when this is set to TRUE (or 1).
This example shows how to exit a scene by sending a empty url to an Anchor node.