I hope its not tied to the cash registers !!!
Early one, there were a bunch of retail shops that installed wifi to connect their registers to the internet to do credit card/check validation. In some cases, they either ran no security, used the default pass phrases for their wireless access point, or used 40bit WEP that was broken very easily. By now, I am assuming that all of this has been fixed ... if you get access, but they don't advertise the feature, I would worry about transacting business there.