This appendix will document how each SpecTcl command executes in mpiSpecTcl. The operation
of a command not only depends on which class wrapped it but which resources are visible in each
process. For example, gate uses services provicded by
CHistogrammer in the Event SInk Pipeline process, while, in all other processes,
it simply manipulates a gate dictionary that provides access to all of the gate definitions
via the SpecTcl API singleton.