Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

_character_set_alias
_cs_blkdesc
_cs_clientmsg
_cs_command
_cs_command_list
_cs_config
_cs_connection
_cs_context
_cs_datafmt
_cs_daterec
_cs_datetime
_cs_datetime4
_cs_dynamic
_cs_iodesc
_cs_locale
_cs_money
_cs_money4
_cs_numeric
_cs_objdata
_cs_objname
_cs_param
_cs_servermsg
_cs_varbinary
_cs_varchar
_csremote_proc
_ct_colinfo
_dblib_error_message
_DBREMOTE_PROC
_DBREMOTE_PROC_PARAM
_dheader
_drecord
_hcattr
_hchk
_hdbc
_hdesc
_heattr
_henv
_hsattr
_hstmt
_null_representation
_options
_pbcb
_procedure
_sql_error
_sql_errors
_tds_bcpcoldata
_tds_compiletime_settings	A structure to hold all the compile-time settings
_tds_cursor	Holds informations about a cursor
_tds_cursor_status
_tds_encoding	Information relevant to libiconv
_tds_errno_message_flags
_tds_error_message
BCP_HOSTCOLINFO
BCP_HOSTFILEINFO
conv_result
cb_t
cc_t
cs_diag_msg
cs_diag_msg_client
cs_diag_msg_svr
DATA
DB_BCPINFO
DBCOL
dbdaterec
DBDATETIME
DBDATETIME4
dblib_buffer_row
dblib_context
DBMONEY
DBMONEY4
DBNUMERIC
dboption
dbstring
dbtypeinfo
DBVARYCHAR
des_key
DSNINFO
DSTR_STRUCT
func_info
LOGINREC
MD4Context
MD5Context
METADATA
namelist
native_info
pd
ProfileParam
s_SqlMsgMap
s_v3to2map
string_linked_list
tag_DBPROC_ROWBUF
TDS8_COLLATION	TDS 8.0 collation informations
tds_align_struct
tds_answer
tds_authentication
tds_blob	Information about blobs (e.g
tds_column	Metadata about columns in regular and compute rows
tds_connection
tds_context
tds_dblib_dbprocess
tds_dblib_loginrec
tds_dynamic	Holds information for a dynamic (also called prepared) query
tds_env	Current environment as reported by the server
tds_locale
tds_login
tds_message
tds_multiple
tds_ntlm_auth
tds_option_arg
tds_pool
tds_pool_member
tds_pool_user
tds_result_info	Hold information for any results
tds_save_context
tds_save_env
tds_save_msg
tds_socket	Hold information for a server connection
tds_time
tds_upd_col
tdsdaterec	Information on data, used by tds_datecrack
tdsdatetime
tdsdatetime4
tdsiconvinfo
tdsmoney
tdsmoney4
tdsnumeric
tdsoldmoney
tdsunique
tdsvarbinary
tdsvarchar