US7ASCII database and Japanese data

Hi,
I am trying to use 9.0i OCCI to build a simple client app which reads Japanese messages out of our database. The database has US7ASCII char set ( I ran SELECT * FROM NLS_DATABASE_PARAMETERS to determine it. )
I have set NLS_LANG to JAPANESE_JAPAN.JA16SJIS in the registry, on my client machine but data comes out as garbage. It comes out alright via Remedy client application. What do I need to do in order to read it with OCCI?
Please help.
Thank you.

Thank you very much Justin for your reply.
I managed to fix my app by setting the char set to US7ASCII on my client, but you confirmed my suspicion. It appears that Oracle indeed uses 8 bits for data even if you specify 7bit char set, but as you pointed out the disaster may come when you least expect it. I read Oracle documentation, it seams that the most optimum solution would be to upgrade the char set to UTF8 by running
ALTER DATABASE CHARACTER SET UTF8
in which case the data will be stored in Unicode, and there will be virtually no storage space increase or performance penalty.
I guess my further question is - what will be the best way to build my C++ client in that case? Logically it seams that I should use wchar_t for simplicity ( I am not sure about performance). My understanding is that data coming from Oracle will be in Unicode, provided that I set my clientfs NLS_LANG to UTF8. But I guess there is a difference between UTF8 and 16 bit encoding, which is used by Windows. Will OCCI handle that if I simply build my client with _UNICODE setting, or do I have to do some transformations?
Another issue is that we currently have a lot of C++ char based code, which manipulates that data, then stores it in different files. There are a lot of char strings embedded in the code. To convert it all to wchar_t might be a quite sizable effort, so I might need to resort to multi-byte strings instead of Unicode. If I set my clientfs NLS_LANG to JA16SJIS will I be getting the correct data out of Oracle?
Thank you again.
I appreciate you help.

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I am using Window XP and Oracle 10g
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*Q1) If i were to use a unicode client, what should i set my NLS_LANG character set to ?
AMERICAN_AMERICA.UTF8 ?
*Q2) Where do i set the NLS_LANG character set information in SQL Developer, i know there is a metalink for setting NLS_LANG using isqlplus but i cant seems to google any result for SQL developer.
Q3) Is my basic understanding right until this point ? If not, please explain in a more generalised term as i am really not familiar with character sets, code page, unicode , glyphs and fonts..
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There is still a need to set the NLS_LANG so that correct conversion can take place between the client and the >>database.
For e.g, when retrieving if we set the NLS_LANG character set to ZHS16GBK (chinese) and the data store in >>unicode in database is E.G (THAI) , then the conversion would be wrong .am i right on this point for UNICODE supported client ?
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Million thanks again for sharing.
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