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Short for "Escape Window." Technology used by the Red Planet military and the 31 Machine Primevals to open a "gate" connecting two points in space, allowing for reduced time in travel between them. ES Windows may also be used at a smaller scale to displace physical weaponry such that it strikes the enemy from an unpredictable angle (as with J-Ark's ES Missiles) and, as the name suggests, to provide a temporary means of escape from enemy attack.
The Galeorea Comet acts as a "natural" ES Window that travels through space, to a duplicate of itself on the "other side."