To be considered compatible with the Public Health Information Network (PHIN), a TB application must be able to interoperate within the PHIN environment. This means that it should be capable of exchanging Reports of Verified Cases of Tuberculosis (RVCT) information, and comply with the PHIN Messaging Services (PHIN-MS) as well as with the PHIN Vocabulary Access and Distribution System (PHIN-VADS). Each of these is briefly described below. It should be noted that this section describes PHIN compatibility and not PHIN certification. Certification is a much more involved and lengthy, formal process. Certification is not focused on specific systems or applications, but on state implementations of solutions. A COTS product cannot be certified as PHIN-compliant. Only a state implementation of that product can be certified by the certification team as compliant within a larger solution that includes both technologies as well as supporting business processes.