thanks Jeff and cruser3,


But I don't think this is the case of my database.
I have queried sql stmnt below for so many times, and yet
it produces the same result and to think that I have more
than 25 application tester + about 30 concurrent connections from development team, it's just to impossible to have the same output.

sql stmnt:
select sid, serial#, server, machine, program
from v$session;

I will try later using another attribute of MTS_DISPATCHERS like
DESCRIPTION instead of PROTOCOL and see what happen.

again, thanksalot.