Could you be a little more specific about what you want to do? Here is why I ask. The presumption is you have some "device data" that lives on your device. A user, presumably, can surf to your device and get the current state of that "device data".
Now you are indicating (I believe) that at certain times that device data is updated. I think you are asking whether using conventional web means the device can tell the browser, "Hey Mr. Browser I have updated data for you.". I believe the answer to this is no.
What can you do:
1) As Campbell recommends put in a meta that on a regular basis requests updated data.
2) Have the user hit F5 (I believe it is key F5). That requests a refresh on a one time basis.
3) Exit the browser and rerun the browser.
The dynamic data paper that Campbell described involves java applets and a thread on the device that is feeding data to the applet running in a browser, on a regular basis. it is possible that java applets are outside of the scope of what you want to do. They also have a lot of security restrictions.