Here are the data structures with brief descriptions:

Ccell_s	A single cell in the cell table, repesenting a single output channel
Ccr_s	Channel range node that maps sequence channel indices to unit and circuit numbers
Cctable_s	Represents a table of cells that map raw FSEQ sequence indexes to a known unit and channel number
Cctgroup_s	Represents a group of linked cells that share the same unit number, channel selection bitmask, and output intensity value
CFC	File controller that wraps a stdlib file pointer and provides additional functionality for reading files, including thread-safe access
Cfd_list_s	Represents a list of frame data blocks
Cfd_node_s	Represents a node in a list of frame data blocks
Cframe_pump_s	Frame pump state controller for loading/tracking frame data
Cfseq_var_s	Represents a variable that can be encoded in the FSEQ format
Cplayer_rtd_s	Player runtime data structure
Cq_s	Queue structure for managing playback requests
Cqentry_s	Queue entry structure that holds playback configuration data
Cserialdev_s	Serial port communication device
Csleep_coll_s	Sleep collector structure for providing historical sleep performance data to better estimate sleep times
CtimeInstant	Represents an instant moment in time