Yup. A quick point force -preferably in a corner - works much better on tempered glass than bashing at it, even an edged weapon, and particularly when the ability to get a good swing may be limited. I carried an 'automatic' (spring loaded) centre punch in my brief case and still have a pointy tool in all of our vehicles, even a little one on the m/c (Google image). In training, I saw it done with a quick whack by a windshield wiper arm.
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Windshields are another thing since they have a layer of plastic laminated in the middle, and require a breaching tool not unlike an old-style can opener.
Sorry, I was never trained on zombies.