The DCS is the primary user interface to the overall facility process including the subsea system. Process data management is handled by the DCS as well as all process alarming, alarm management and event / data archiving. Although an MCS may have an alarm or event queue, the primary facility alarm management occurs at the DCS level. Access, to the various subsea control functions, are managed by the DCS user access level rather than in the subsea system. The DCS also serves as the master for time synchronisation (for addition details see section 11).