Session level NLS_COMP NLS_SORT not inheriting from instance parameters???

Hi all,
I have an Oracle 11g installation with a database setup as follows: NLS_COMP=BINARY, NLS_SORT=BINARY.
After playing a bit at the session level with NLS_COMP=LINGUISTIC and NLS_SORT=BINARY_CI, I persisted them at the instance level via ALTER SYSTEM with SCOPE=SPFILE.
Bounced the database and voila, when I query nls_instance_parameters it reflects my changes.
Problem is, my parameters are not applied to my session: in fact, if I query nls_session_parameters, both are still set to BINARY. (Note: using sqlplus).
The documentation (http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/create006.htm) states:
"A new session inherits parameter values from the instance-wide values."
Am I missing something here? Is sqlplus somehow overriding the instance-level parameters? (I know sql developer may, depending on your options, hence I went back to basics...).
Any help appreciated!
Thanks in advance,
Paolo

Hi Sergiusz,
Thank you again for your reply.
In my registry NLS_LANG is set to its default value (AMERICAN_AMERICA.WE8MSWIN1252), so I assume that unless I set anything specific in my environment, NLS_COMP and NLS_SORT are affected by that and sort of reset to BINARY?
If this is the case, then I'm struggling to understand the purpose of setting them at the instance level, given that as you said, NLS_LANG shouldn't be removed as an environmental variable and it seems to override them?
Along the same lines, if I understand this correctly, should I have no control over the environment that my application runs in (e.g. a web application running in a shared IIS app pool), then the only option left is (re)setting my variables every time I establish a connection with the Oracle db, thereby starting a new session?
Really appreciate your help.
Cheers,
Paolo

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Session level NLS_COMP NLS_SORT not inheriting from instance parameters???

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