Yes the normal values for a DD object will update automatically, but passing those values to some other paramater wont. You'll need to use an event script to make the pass, and currently there's no way to have event scripts automatically excute on a timed basis.
Since most of the possible DD values are passed to paramaters other than text, it'll be tricky to determine what all is being passed. Using a text object should make a few things obvious without any special tricks. If the text changes, the text param is gettign data. If mouseover gives a tooltip, tooltip is getting data. If the text is a different color than what you assigned in the XML, color data is being passed.
Some possibilities will be object specific. For example I don't think a text object will even recieve progress values even if the DD contains it. You'll need to use an object that accepts the type of data you want to test for.
All a DD filter does is block everything except the paramater you specify. It doesn't chage where the data goes. For example, a color filter wont pipe the color value to the text paramater. So if you want to see exactly what the value is, you'll need an event script that applies that vlaue to something readable. I find tooltip to be handy for this sort of testing since prety much every object has a tooltip param. Something like OnHoverIn="tooltip=progress"
FYI, from what I've seen, DD prety much only contains text and maybe a tooltip and/or color unless it already does something else in the default UI.
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