Zorken

You have just entered a large quiet darkened room late at night. Computer terminals are sitting at tables all around the room. There is no one else here. As you sit at a terminal to check mail you see the edge of an old yellowed note sticking out from under the terminal. You pull out the note and read it. The note says;

Behind the portrait in the hall,
Beneath the clock upon the wall,
Lie the sources that you seek,
Of Zorken dungeons dark and deep.

PS. What do you get when you divide by Nixon?
PPS. Read Fortran much?
PPPS. You owe me 10 zorkmids and a beer.