It is a touch sensitive button to the right of the power button
You have to get a dell that has a touch screen
About $850.
Using a touch screen on Dell computer is faster, and easier than using a mouse or a track pad. If the Dell computer has a stylus input, one easily can write and draw directly on the screen.
The Dell Streak.
If you mean screen wise it is 10.5inch full touch screen.
No it does not work that way
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.
I think you hold the control (CTRL) button and scroll the mouse at the same time to adjust the screen.
On the Dell website, one can buy the following items: laptops, ultrabooks, desktops, printers and ink, televisions, monitors, gaming alienware, tablets, touch screen laptops, and touch screen ultrabooks.
There is a button on the right side on the place where the screen interlocks with the keyboard. It is a circular button that lights up when you press it. It is the button behind where you plug it in to charge.
The most popular brands of touchscreen laptops in 2012 were Acer, Toshiba, Asus, Sony, Dell, HP and Lenovo. So far the Lenovo IdeaPad Yoga 13 gets some of the best reviews for touch screen laptops.