Array Modifier Questions

In this tutorial at about 6:20 he moves panels lining the windows to all of the other windows, using properties of the array modifier. I couldn’t figure out how to do this. If someone could give me the hotkey for this and an explanation of the feature it would be most welcome.

to do something like windows on a skyscraper, you have to use 2 array modifiers, one for horizontal, and an additional one for vertical

I created flower and tried to group objects along nurbcurves and lattice by using array modifier but it turned out one object out of all objects. Can I find a way to make all items into array modifier as duplicate flowers?

you probably have to use dupliverts for that.

i know i feel moron but i have to ask that question. where i can find duplivert there?