Is there a way to determine if a GWT app is active or inactive?

Is there a way to determine if a GWT app is active thru the Window or
DOM class -- well, or any other class -- be that a callback / event or
inspection of a static variable in a built-in object?

Specifically meaning that the browser window is not minimized, or that
if open the browser window it is the top/active window, and beyond
that that the GWT app's tab and not another tab in the browser is the
active tab? I imagine it's something right in front of my face, but
I'm just not seeing it. (We do use Sencha's GXT v2.x too)

The reason I ask is our application uses a Timer to update data. If
the app is left I want to keep updating its data for 5 minutes, but
then stop the timers after that. And of course the compliment; if the
app is returned-to, to re-initiate the timed data updates.

Thanx very much,
-steve

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