Access codes are four, 32-bit numeric sequences serving as unique identifiers of the developer using Guardant dongles as well as of the dongles themselves.
A unique set of access codes is assigned to the developer at the time of the first order of Guardant dongles and further, is written into each dongle prior to their sale. The access codes provide a unique identifier of each developer using Guardant dongles. Dongles with specific access codes can be purchased only by an individual/company owning those codes.
During the installation process of the Guardant software you must enter the access codes of a dongle. Without the access codes you cannot install the Guardant SDK.