is there a way to find out the tty from which the process is launched

Hi all,
There is an application which can be launched once on our box and there are several suspected users telnet into the system with the same login ID.
Is there a way that i can find out from which tty the application is launched? If so, i can get the user name from the "finger" command.

Thanks in adv.

it can be viewed by "ps -ef". Sorry for posting such a simple question.