refresh flex page

[hadar]

Hi,

I have a MXML page that contain data that I can change on the server.
How can I know if another user/session modify this value ?

Do I need to make some polling/refresh to get the info from server every period of time ? How it can be done ?

Or Can the client get notify when data on server changed (server push data) ?
I am working with blazeds (tomcat) .How do I implement this ?

Thanks