Hi,
If there are many users logged in as one name that normally happens in Development. Here is a way to find out.

Select userenv('terminal') from dual; It Gives you the Terminal
Select userenv('sessionid') from dual; -- This gives you the session id... If want more find here

select audsid sessiond, OSUSER, MACHINE, TERMINAL, PROGRAM from v$session
where audsid = (select userenv('sessionid') from dual)

Hope this will help.

Thanks.