It seems that if I launched another AVD (NOT another Android application directly from Eclipse, which naturally calls AVD), and THEN starts the second application from Eclipse and selects the just called AVD to start it, it will automatically use 5556 (from earlier running Android application using 5554). So: the problem is solved; it seems that there is no need to go to the command line, it is just a matter of things in a certain order.
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