How can more than one online log file be CURRENT?

SQL> select * from v$log;
    GROUP#    THREAD# SEQUENCE#      BYTES BLOCKSIZE    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
         1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          1      73394   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
6 rows selected.
I found this in the oracle docs:
"Oracle Database uses only one redo log files at a time to store redo records written from the redo log buffer. The redo log file that LGWR is actively writing to is called the current redo log file."

this is where it confuses me actually. I also thought about 2 nodes writing to 2 online log. But when I was querying gv$log, I saw 4 CURRENT entries.
SQL> select * from gv$log;
   INST_ID     GROUP#    THREAD# SEQUENCE#      BYTES BLOCKSIZE    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME
         2          1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          2          1      73394   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         2          4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         2          5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         2          6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          1          1      73393   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          2          1      73394   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          3          2      64918   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         1          4          2      64917   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
         1          5          1      73395   52428800        512          2 NO CURRENT             1.2618E+13 09-SEP-13   2.8147E+14
         1          6          2      64916   52428800        512          2 YES INACTIVE            1.2618E+13 09-SEP-13   1.2618E+13 09-SEP-13
12 rows selected.
SQL>
Maybe the thread# is the key? What does thread# mean here. Oracle doc of thread# doesn't describe much:   -> V$LOG

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