Hmm, I heard that Alison wants to wants to open a shop selling books and presents! Since she has to take note of all the things that she sold, she could possibly need a touch screen, printer and an usb!
She would need a touch screen because using a touch screen, she can do the work much more quicker than using a normal computer. Also she would need a printer because she has to print the receipt for the customer and herself to know what she has sold. In the end of the day, she can back up what she sold into a USB and carry it around easily!
I hope that helped. Good luck with your shop Alison!