[jsb5717]

Yes, frameless window. A paneless window would have no glass...interesting window.

These windows are all tempered glass...when they break it will be into a million pieces. Tempered glass is both stronger and more fragile at the same time. Tempered is used so that when it does break there aren't sharp knife-like shards of glass flying about. It's often called Safety Glass for that reason.

While T Glass can take a much harder hit to the flat surface without breaking, the edges can be more senstitive. A little nick can easily shatter it. I suppose that it's possible to catch a rock on the exposed edge of the glass in travel and have it break later. Who knows how it happened. It's just a bummer