  The movement of the Relativistic Heavy Ion Collider (RHIC) through its
various states (eg. injection, acceleration, storage, collisions) is controlled
by an application called the Sequencer. This program orchestrates most magnet
and instrumentation systems and is responsible for the coordinated acquisition
and saving of data from various systems. The Sequencer system, its software
infrastructure, support programs, and the language used to drive it are
discussed in this paper. Initial operational experience is also described.
