v$session -KTSJ module

Hi ,

I have RAC setup with 2 nodes.I can se following module in v$session.

select module,count(*) from v$session group by module;

MODULE                                                             COUNT(*)
---------------------------------------------------------------- ----------
                                                                         39
JDBC Thin Client                                                         86
KTSJ                                                                     10
Streams                                                                   3

What is KTSJ and Streams?Why module is coming as null and 39 connections are there for null?

Thanks