Easy one: Communication in MDI

Ok, we've got an interface that has 5-6 child windows. The main window
has a timer / slider control that determines what data the children
show. Currently the Main form code is doing all the calculations. I
want to move it to an easier to maintain object-interaction method.

What's the best way to tell a child window to update the data? Is
message posting the prefered method? (Just PostMessage to each child
window when timer fires, and let the child decide whether or not to
update?)

Thanks,
Josh McFarlane

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