Enables customers to access primary services nodes (PRSNs) to obtain key management infrastructure (KMI) products and services and to generate, produce, and distribute traditional (symmetric) key products. The management client (MGC) configuration of the client node allows customers to operate locally, independent of a PRSN.
Sources:
CNSSI 4009-2015 from CNSSI 4005

  An interface for human users, devices, applications and processes to access CKMS functions, including the requesting of certificates and keys.
Sources:
NIST SP 800-57 Part 2 Rev.1 under Client node