Well, I see what you meen .. but, if I run a query on v$session from PLSQL Dev I get the following result:
select terminal, program
from v$session
where schema# != 0
TERMINAL PROGRAM
--------- ----------------
SNAKE
SNAKE PLSQLDev.exe
SNAKE PLSQLDev.exe
The empty value in the program column is my own app running DOA.
The Module and Action is something else, as I see it.