Jose,
The short answer is yes. Here is an example that creates a window and moves it to a new monitor and lets me control it from the original Notebook. The key is to find the location of your second or third monitor. I did that by manually moving a window there and doing the following
testwindow = CreateWindow[];
move the window to the second monitor (you can also size it by setting that option as well) and do
myMargins = WindowMargins /. Options[testwindow, WindowMargins]
(* {{876, Automatic}, {Automatic, 242}} *)
copy the location and use it below. The notebook does the following:
Create a dynamic slider to control it
DynamicModule[{}, {Slider[Dynamic[x], {.1, 2}], Dynamic[x]}]
You can plot something on your main monitor:
DynamicModule[{}, Dynamic[Plot[Sin[x*t], {t, 0, 10}]]]
Now duplicate it in a new window and send it to the other monitor:
win = CreateWindow[
DocumentNotebook[
DynamicModule[{}, Dynamic[Plot[Sin[x*t], {t, 0, 10}]]]]]
SetOptions[win,
WindowMargins -> {{-1378, Automatic}, {Automatic, 41}}]
Now control both plots from your slider. You can obviously mix and match various controls and dynamic graphics.
Regards,
Neil