DBCONTROL
mode-800  =  DBFIND mode-12 returns the prior list if the refinement
             results in zero entries qualified.
mode-801  =  DBFIND mode-12 with no entries if the refinement results
             in zero entries qualified.
mode-802  =  exposes the third-party index data sets within the database.
mode-803  =  hides the third-party index data sets within the database.

DBFIND
mode-10   =  performs a standard DBFIND on a detail search item
             passed through the item parameter -- same as mode-1
mode-11   =  performs a range retrieval for numeric sorted keys of types
             E, I, J, K, P, R and Z.  Argument contains the start and
             stop values for the range which must be passed as the same data-
             type and length as the key.
mode-12   =  performs a keyword search and returns a chain count.
mode-13   =  restores back to the most recently qualified list for single
             or multiple keyword/key retrievals.
mode-21   =  same as mode-1 but does not return a chain count
mode-22   =  same as mode-11 but no chain count
mode-23   =  same as mode-12 but no chain count


The following modes represent programmatic methods of enforcing the
relational operators:


mode-1nn  =  performs an equal-to (=) operation on the argument - by words
             if positive, bytes if negative.
mode-2nn  =  performs a greater than (>) operation on the argument
mode-3nn  =  performs an equal to or greater than (>=) operation on the argument
mode-4nn  =  performs a less than (<) operation on the argument
mode-5nn  =  performs a less than or equal to (>=) operation on the argument
mode-1nnn =  allows for third party extensions beyond the standardized functions


DBGET
mode-5    =  if following a generic key search it reads the next record in
             the chain using the third party indexing product.
mode-6    =  if following a generic key search it reads the previous record
             in the chain using the third party indexing product.
mode-11   =  resets the pointer to the beginning of the list of qualified
             records for generic key search.
mode-12   =  moves pointer forward "n" entries in the list of qualified
             records for a generic key search.
mode-13   =  moves pointer backward "n" entries in the list of qualified
             records for a generic key search.
mode-15   =  same as mode-5 but not inhibited by an end-of-chain.
mode-16   =  same as mode-6 but not inhibited by a beginning-of-chain.
mode-21   =  resets pointer to the beginning of the list of qualified
             entries for a keyword retrieval.
mode-22   =  moves pointer forward "n" entries in the list of qualified
             records for a keyword search.
mode-23   =  moves pointer backward "n" entries in the list of qualified
             records for a keyword search.
mode-25   =  retrieves next record buffer from those qualified by keyword retrieval.
mode-26   =  retrieves previous record buffer from those qualified by keyword retrieval.
mode-1nnn =  the range of modes 1000 - 1999 (inclusive) is reserved
             for TPI functions beyond the standardized functions.

DBOPEN
mode +100 =  adding 100 to existing modes opens the database but disables
             TPI - affects DBFIND and DBGET only.
mode 1nnn =  the range of modes 1000 - 1799 (inclusive) is reserved
             for TPI functions beyond the standardized functions

DBINFO
mode-801  =  returns information on the TPI package.
mode-802  =  number of external and internal TPI index files
mode-803  =  indicates whether TPI is enabled.
mode-811  =  describes access available for the data item or TPI key.
mode-812  =  describes the TPI key.
mode-813  =  identifies all data items including all TPI keys and type
             of access allowed.
mode-814  =  identifies all data items available in a specific set.
mode-821  =  identifies all data sets available which contain the specified TPI key.
mode-831  =  identifies TPI generic search keys for specified data set.
mode-832  =  identifies third-party single or keyword search keys for
             specified data set.
mode-833  =  describes a specific TPI key.
mode-834  =  describes all items grouped with the specified key.