To my knowledge (at least when I was there) there is no master password or backdoor password to get in to the Tenors. The only way for quintum to get in is to get the hex number that comes up at the login prompt, enter this into a program and it spits out a time sensitive password to get in. This program is secure on an internal server at Quintum and is not accessible from outside their network. So even if someone leaves Quintum, they cannot access this program and hack in. However, there may be a hole in the software that someone found.
have a good vacation.