One of my clients had an old windows tablet sitting around doing nothing.
So what they did was connected a scanner to it, linked it by wifi to the Tyro unit and their main receipt printer and are now using it at their merchandise counter as an extra workstation.
Here are a couple of pictures.
Although it is a cheap tablet with 2 Gb RAM running Windows 8, it works perfectly. It is also mobile, which can be really useful in the shop.
This is a great example of how flexible our point-of-sale system is!