I would argue that a deck requires two entry points; one to the internal space, one to the external space.
In philosophy the only point you could have a window as an entry would be if the windows were floor-to-ceiling in height and could be traversed through, almost like a door or bi-fold door.
I would also put forth that you can have an open deck, even if it has a ceiling, insulation etc. However, if you then enclose this by way of wall, glazing or operable doors or both, the deck basically becomes a multi-purpose space which could be considered a house extension of sorts.
Are you trying to outsmart your council?