oracle user in unix - "extern security"

hello,
I have a great problem;
on an oracle8i-db (I only read data from the tables for information) on hp9000-ux the user stored only on system-security from unix.
I need to access the tables with correct "user-login" directly with ora-client from my windows-machine.
my app runs well with a user, that I create with oracle-password, but the app-user need to connect with the "unix-"password (but how?)

a dummy-user don't solve the problem, because I need the correct username (sometimes not the same as os-user!) to filter the rows&columns.

Do anyone have a tip for my problem ?

;-) thomas, bavaria
 
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