For Point of Sales, PCI compliance is what you need to follow - http://www.pcicomplianceguide.org/
You might want to look at Windows Embedded 8 Industry since it helps get you closer to PCI compliance with security policies set.
www.annabooks.com / www.seanliming.com / Book Author - Pro Guide to WE8S, Pro Guide to WES 7, Pro Guide to POS for .NET
Thanks for your reply
Concerning PCI compliance, I will try to understand.
I have some question to ask.As below link.
Can the logo of “Powered by Windows Embedded” access on POS also? If can access, where able to get the information.