Datasource-less connection

Dear Fellows,

I searched through the archives but couldn't find the answer; if you can,
please show me to the right direction.

QUESTION: is it possible to make a datasource-less connection via psqlodbc
driver in Windows?

EXPLANATION: we use ODBCExpress, and it states in a whitepaper that hdbc can
be configured either via DSN or by hand, which is driver specific.

We'd like to know if PostgreSQL supports this kind of connection and what
are the allowed attribute names and values.

TIA,

G.
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