Discrimination in the private sector is not directly constrained by the Constitution, but has become subject to a growing body of federal and state law.
Switch Access lets you interact with your Android device using one or more switches instead of the touch screen. Switch Access can be helpful for people with dexterity impairments that prevent them from interacting directly with the Android device.
Network switches store a list of MAC addresses seen at every port and only forward packets to the ports that need to see the packet. Wireless access points often use MAC addresses for access control. They only allow access for known devices (MAC address is unique and identifies devices) with the correct passphrase.