Here are the data structures with brief descriptions:

__dpmi_regs_d
_DEV_COM_INFO
_DEV_INFO_WIDTH
_DEV_PRINTER_DEVICE
_DEV_PRINTER_EMU_MODE
_DOS_COUNTRY_INFO_GENERAL
_driver_depth_modes
_EVENT
_FB_ARRAY_TMPDESC
_FB_BASEVT
_fb_ConHooks
_FB_CONSOLE_CTX
_fb_Coord
_FB_DATADESC
_FB_DIRCTX
_FB_DOS_STACK_INFO
_FB_ERRORCTX
_FB_FILE
_FB_FILE_HOOKS
_FB_KEY_CODES
_FB_KEY_LIST_ENTRY
_FB_LIST
_FB_LISTELEM
_FB_LOCALE_INFOS
_FB_OBJECT
_fb_PrintInfo
_fb_Rect
_FB_RTTI
_FB_SERIAL_OPTIONS
_FB_SIGHANDLER
_FB_STR_TMPDESC
_FBARRAY
_FBARRAYDIM
_FBCOND
_FBCONDOPS
_FBSTRING	Structure containing information about a specific string
_FBTHREAD
_FormatMaskInfo
_GFX_CHAR_CELL
_JOYDATA
_JS_EVENT
_LINUX_SERIAL_INFO
_PUT_HEADER
_W32_PRINTER_INFO
_W32_SERIAL_INFO
AR_H
AST_BREAKLIST
AST_CALL_CTX
AST_DATASTMT_CTX
AST_DTORLIST_ITEM
AST_DTORLIST_SCOPESTACK
AST_GLOBINST_CTX
AST_NODE_ARG
AST_NODE_ASM
AST_NODE_BLOCK
AST_NODE_BREAK
AST_NODE_CALL
AST_NODE_CAST
AST_NODE_DATASTMT
AST_NODE_DBG
AST_NODE_IDX
AST_NODE_IIF
AST_NODE_JMPTB
AST_NODE_LABEL
AST_NODE_LINK
AST_NODE_LIT
AST_NODE_LOAD
AST_NODE_MEM
AST_NODE_OFFS
AST_NODE_OP
AST_NODE_PROC
AST_NODE_PTR
AST_NODE_STACK
AST_NODE_TYPEINI
AST_NODE_VAR
AST_OPINFO
AST_PROC_CTX
AST_TMPSTRLIST_ITEM
ASTASMTOK
ASTCTX
ASTNODE
BMP_HEADER
buffer_t
COFF_H
COFF_SH
comm_props_t
DATABUFFER
DEV_LPT_INFO
DEV_LPT_PROTOCOL
DEV_SCRN_INFO
DEVENUMDATA
DOS_SERIAL_INFO
EDBGCTX
ELF32_H
ELF32_SH
ELF64_H
ELF64_SH
EMIT_BOPNODE
EMIT_BRCNODE
EMIT_DBGNODE
EMIT_JTBNODE
EMIT_LITNODE
EMIT_MEMNODE
EMIT_NODE
EMIT_RELNODE
EMIT_SOPNODE
EMIT_STKNODE
EMIT_UOPNODE
EMIT_VTBL
EMITCTX
EMITDATATYPE
Entry
ENTRYINFO
ERRPARAMLOCATION
EXPRCACHENODE
EXPRNODE
FB_CALL_ARG
FB_CALL_ARG_LIST
FB_CMPSTMT_DO
FB_CMPSTMT_EXTERN
FB_CMPSTMT_FOR
FB_CMPSTMT_FORELM
FB_CMPSTMT_IF
FB_CMPSTMT_NAMESPACE
FB_CMPSTMT_PROC
FB_CMPSTMT_SCOPE
FB_CMPSTMT_SELCONST
FB_CMPSTMT_SELECT
FB_CMPSTMT_WHILE
FB_CMPSTMT_WITH
FB_CMPSTMTSTK
FB_DEFPARAM
FB_DEFTOK
FB_DIRCTX
fb_dos_pal_t
fb_dos_t
FB_DTORWRAPPER
FB_ERRCTX
FB_FLASHWINFO
FB_GFXCTX
FB_GL
FB_GL_PARAMS
FB_GLOBCTORLIST
FB_GLOBCTORLIST_ITEM
FB_GLOBINSTANCE
FB_HOOKSTB
FB_INITCTX
FB_INPUTCTX
FB_LANG_CTX
FB_LANG_INFO
FB_LETSTMT_NODE
FB_MANGLEABBR
FB_MANGLECTX
FB_PRINTUSGCTX
FB_PROCDBG
FB_PROCERR
FB_PROCEXT
FB_PROCGSB
FB_PROCOPOVL
FB_PROCOVL
FB_PROCRTL
FB_PROCSTK
FB_RTL_MACRODEF
FB_RTL_MACROTOKEN
FB_RTL_PARAMDEF
FB_RTL_PROCDEF
FB_RTLIB_CTX_
FB_RTTICTX
FB_SCOPEDBG
FB_SCOPEEMIT
FB_STRUCT_DBG
FB_STRUCTEXT
FB_SYMBID
FB_SYMBNEST
FB_WGL
FBARRAYDIM
FBC_EXTOPT
FBC_OBJINF
FBCASECTX
FBCCTX
FBCIOFILE
FBCMMLINEOPT
FBCONSOLE
FBCPUTYPEINFO
FBCTX
FBDEVDRIVER
FBENV
FBFILE
FBFWDREF
FBGFX
FBGFX_CHAR
FBHASHTB
FBHASHTBLIST
FBMAIN
FBNAMESPC
FBNAMESPC_EXT
FBOPTION
FBPARSER_STMT
FBPARSER_STMT_LET
FBS_ARRAY
FBS_BITFLD
FBS_DEFINE
FBS_ENUM
FBS_FWDREF
FBS_KEYWORD
FBS_LABEL
FBS_NAMESPACE
FBS_NSIMPORT
FBS_PARAM
FBS_PROC
FBS_SCOPE
FBS_STRUCT
FBS_VAR
FBSYMBOL
FBSYMBOLTB
FBSYMCHAIN
FBSYMHASH
FBSYMLIST
FBTARGET
FBTOKEN
FBVALUE
FBVAR_DATA
FBVAR_DESC
FBVARDIM
FBWARNING
FONT
GFXDRIVER
GFXMODE
GLXFUNCS
GOSUBCTX
gosubnode
GPM_FUNCS
HASHITEM
HASHITEMPOOL
HASHLIST
IR_VTBL
IRCALLARG
IRCTX
IRHLCCTX
irq_props_t
IRTAC
IRTAC_CTX
IRTACVREG
IRTACVREG_GRP
IRVREG
KEY_DATA
keyconvinfo
KeysymToScancode
LEX_CTX
LEX_TKCTX
LEXPP_ARG
LEXPP_ARGTB
LEXPP_PRAGMAOPT
LEXPP_PRAGMASTK
LEXPP_REC
LZW_ENTRY
MODEINFO
MODESLIST
NameInfo
NODE
OBJINFOPARSERCTX
PALETTE
PARSERCTX
PP_CTX
REG_REG
REG_REGCTX
REG_STKCTX
REGCLASS
RTLCTX
SECTIONENTRY
SELECTCTX
SPAN
SYMB_DATATYPE
SYMB_DEF_CTX
SYMB_DEF_PARAM
SYMB_OVLOP
SYMBCTX
SYMBDEF
SYMBKWD
TFLIST
TFLISTITEM
THASH
TLIST
TLISTNODE
TLISTTB
TPOOL
TPOOLITEM
TSTACK
TSTACKNODE
TSTACKTB
TSTRSET
TSTRSETITEM
VbeInfoBlock
VesaModeInfo
VesaPMInfo
WIN32DRIVER
X11DRIVER
X_FUNCS