yes it is
No.
Only if you have a touch screen. Even Vista can make use of a touch screen, yet Windows 7 has a much better level of functionality. The "Windows Touch" function on Windows 7 allows a user to operate the computer using iPhone and Microsoft Surface methods of using a touch screen (like pinching two fingers to zoom, flicking a finger to scroll down, etc...)
It depends what device you put it on...
Windows 8 has been specially designed for touch-screens. However, that doesn't mean that it won't do its job in mouse-keyboard hardware.
Windows SST is the "Small Screen Touch" program developed by Microsoft to work on small touch screen devices. Unfortunately, it has not sold as many units as expected, even with the discounted price.
Many companies are offering touch-screen laptop computers, for use with the touch screen capability of Microsoft Windows 8. These companies include Google, Dell, Toshiba, Lenovo, and Acer.
You can't simply activate touch screen just because your computer runs Windows 8. You have to buy a computer with a touch screen display.
No. You don't need a touch screen to use Windows 8. It will work just like a regular PC or laptop.
You can infact change any LCD screen to a touch screen display. If you wish to use the touch screen as a display and input device you must install other software on your computer to recognise the touch screen input.
It is software because it is on your computer and you cant touch it. If you can pick it up then it is hardware but if you cant touch it and its on your computer screen (eg. Windows) then it is software.
If you are talking about the Menu, you can press X, or the menu is available on the touch screen already. If you are talking about windows in the buildings, you cannot open them. If you are talking about Windows for computers, Windows cannot run on any DS.
A nice touch screen kit can be bought from online retailers Amazon or eBay. These kits are easy to install, they provide software, require a USB port, and are compatible Microsoft Windows platforms.