Orthodox use of PQtransactionStatus

Hi All.
Does somebody know where (some internet sites or sample code) I can achieve
a good understanding in the use of the
status PQTRANS_IDLE, PQTRANS_ACTIVE, PQTRANS_INTRANS, PQTRANS_INERROR,
PQTRANS_UNKNOWN using the lib function
PQtransactionStatus?
I need to use this flags in order to discipline some BEGIN-COMMIT blocks in
a multithreading Windows/Linux
environment.

Each thread uses a separate db connection and shouldn't have any interaction
with the other threads, but I still
have messages as "WARNING: There is already a transaction in progress" and
"WARNING: There is no transaction in
progress". A further information is that the DB operation involved in each
thread is a store in a table. This table
is the same for each thread.

Thanks in advance.

Luca.
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