> When building ODBC connection string for PostgreSQL there are
> constants beginning with A, B and C. Where can I find description of
> each of these ?
There is a HowTo on the psqlODBC site that mentions those codes.
Keep in mind that those are MS-Access specific abrevations for ODBC
parameter names and that the HowTo is a bit dated so probably a newer
Access version might not need or might not support those codes at all.