I have seen in some hotels that they have windows facing a corridor, hallway
or outside. You can see out but cannot see in. It is more than just
"tinting".

I am looking to replace a few of my windows at home, and I asked for quotes
for non-impact windows and impact windows. I also asked the window
companies if they have windows that can see out but not in, they all said to
me "no not for residential it's only for commercial" and when I asked them
to give me a ball park figure they wouldn't even do that and just said
"trust me, it's VERY expensive".

What is so special about those windows? Is it a special glass? or is it
something you can "apply" onto ordinary glass afterwards? Are we talking
about 10 times more expensive? I have a large picture window inside the
shower facing an interior courtyard, right now I am planning on using
hurricane impact obscured glass window, I thought I ought to consider this
other option but I can't even get a price!

MC