Here are the data structures with brief descriptions:

C__attribute__	Keyword The IMAGE_KEYWORD structure includes :
CAOLOOPCONTROL_CONF
CAOLOOPCONTROL_DM_DISPCOMB_CONF
CAOLOOPCONTROL_DMTURBCONF
Cap_array
CASPHSURFM
CASPHSURFR
CCMD
CCMDARGTOKEN
Ccomplex_double
Ccomplex_float
CDATA
CDM_SIM
CEXAOSIMCONF
CFOCMASK
CGPUMATMULTCONF	This structure holds the GPU computation setup for matrix multiplication
Ckdhyperrect
Ckdnode
Ckdres
Ckdtree
CLOGSHIM_CONF
CMaterialIndex
CMODULE
Cnrlmsise_flags
Cnrlmsise_input
Cnrlmsise_output
COPTSYST
Cres_node
Csavethreadmsg
Csymrec
CTCP_BUFFER_METADATA
CTHDATA
CTHDATA_IMTOTAL
CTIMESPECFIXED	Structure holding two 8-byte integers
CVARIABLE
Cyy_buffer_state
Cyy_trans_info
Cyyalloc
CYYSTYPE
CZERNIKE