The third link was not from a vendor. Here are some non vendor links:
[1] http://en.wikipedia.org/wiki/User_interface - "Touchscreens are displays that accept input by touch of fingers or a stylus. Used in a growing amount of mobile devices and many types of point of sale, industrial processes and machines, self-service machines etc."
Why not quote Wikipedia's article on "Touch Screen": "A touchscreen is an electronic visual display that can detect the presence and ___location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touchscreens can also sense other passive objects, such as a stylus."
Oh wait, because it doesn't suit your purposes either.
[2] http://www.pcmag.com/encyclopedia_term/0,2542,t=touch+screen... - "A display screen that is sensitive to the touch of a finger or stylus."