Well it depends on what type of touchscreen you buy, LCD or CRT. Crt is hard glass like a TV or standard PC Monitor and LCD is like a laptop screen. The touchscreen part is just an overlay built onto an existing display technology.
As for the mouse pointer showing that depends on the software, i have the ability to turn it off in mine. If the option doesn't exist you can still remove the mouse pointer using the windows mouse pointer themes and a blank mouse pointer theme.