How to determine which RAC-instance the appl. is logged onto?

Dear all,
I need to have my application server determine which RAC-
instance is currently active (logged onto). I have a
tnsnames.ora file with a primary-, and secondary RAC-
instance configured, and Failover/Failback between the
instances work fine. However, I would be interested in
determining which instance I am curently using.
Does the Oracle Net Protocol have support for letting me
"read" this out, or...?
Thanks.
Regards, Eldor R.

Thank you for the prompt reply.
Is there, in the Oracle Net Protocol, available
function(s) for reading out this information
directly without "parsing" the trace file?
I would like to read out this information from my
application run-time.
Thanks.

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