Re: POS touchscreen replacement question
Without some more specific details its hard to say for definite.
However, Presuming you have admin rights on the POS computer, replacing the monitor with a USB touchscreen would be fine, you would just need to update and install the new touchscreen software.
Intel Core i5 2500K /-\ 32Gb 1600mhz RAM /-\ Asus P8Z68/GEN 3
2x 256Gb Crucial M4 /-\ Crossfire XFX HD Radeon 7950 Black DD
Sound blaster Z /-\ yourpcperfect.com /-\ Windows 7 Pro