A user interface having a persistent graphical interface element is disclosed. The central server has databases and processing capabilities and is connected to a credit verification system. The detection unit includes first impedance devices and a second impedance device. 1 to 20% by weight of at least one buffering agent having a pKa between 6. The secondary controller stores the customer data from a received frame in memory, and stores the corresponding metadata in another location of memory that is indexed to the location where the customer data was stored. The present invention also relates to a Lactuca sativa plant produced by growing the 45-125 RZ seed.