adding ajax listeners to GMap markers and WebApplication

[shiraz memon]

Hi
I have two questions:
1. Is  there a possibility to add an ajax timer behaviour to individual
marker or an overlay.
2. How do I send an event (could be ajax) from WebApplication to its child
pages, for instance the WebApplication is implementing some database
listener and if the change occurs it should propagate the change to its
selected child pages?
Thanks,
Shiraz