DESC v$SESSION

SADDR   RAW     (4) 	
SID     NUMBER
SERIAL# NUMBER
AUDSID 	NUMBER               <-----
PADDR   RAW     (4)
......
......

SQL> CREATE GLOBAL TEMPORARY TABLE my_gtt(col1 NUMBER, col2 VARCHAR2(30))
  2  ON COMMIT PRESERVE ROWS
  3  /

Table created.

SQL> Begin
  2    INSERT INTO my_gtt VALUES (1, 'One');
  3  End;
  4  /

PL/SQL procedure successfully completed.

SQ2>-- session two
SQ2>Begin
  2    INSERT INTO my_gtt VALUES (2, 'Two');
  3    INSERT INTO my_gtt VALUES (2, 'Three');
  4  End;
  5  /

PL/SQL procedure successfully completed.

SQ2>SELECT * FROM my_gtt;

      COL1 COL2
---------- ------------------------------
         2 Two
         2 Three

SQL>-- session one
SQL> SELECT * FROM my_gtt
  2  /

      COL1 COL2
---------- ------------------------------
         1 One

SQL> truncate table my_gtt
  2  /

Table truncated.

SQ2>--session two
SQ2>SELECT * FROM my_gtt;

      COL1 COL2
---------- ------------------------------
         2 Two
         2 Three