PL/SQL :: How To Use Multiple Concurrent Contexts

I have a context package that uses a session_id.

I want to use multiple sessions as I will have multiple users creating contexts at the same time.

Once the context is created with a session_id I want to reference that session_id in a view.

Can this be done? Using Oracle 10g R2 Context:

 -- create ctxCREATE OR REPLACE CONTEXT MY_CTX USING CTX_PKG ACCESSED GLOBALLY;  -- ctx package  CREATE OR REPLACE PACKAGE CTX_PKG IS    PROCEDURE SET_SESSION_ID (IN_SESSION_ID VARCHAR2);    PROCEDURE CLEAR_SESSION (IN_SESSION_ID VARCHAR2);    PROCEDURE SET_CONTEXT(IN_NAME VARCHAR2, IN_VALUE VARCHAR2); END CTX_PKG;  -- context packatge  CREATE OR REPLACE PACKAGE BODY CTX_PKG IS    GC$SESSION_ID  VARCHAR2 (100);    PROCEDURE SET_SESSION_ID (IN_SESSION_ID VARCHAR2)    IS    BEGIN     GC$SESSION_ID := IN_SESSION_ID;   

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The first query returns valoc but the second query doesn't return the session_id.