HP Vectra 500 - how to open it

My son just dropped off an old HP Vectra 500, and I can find no
obvious way to open it. It apparently has internal cards mounted
sideways, a CDRom, floppy, and Travan tape drive, and what looks
like a network connection on the rear.

The only clue to opening the case is two slides at the bottom left
and right of the front panel, and an embossed arrow on the sides.
Neither position of the slides seems to release anything, so I
would like to know which way what things should move before
applying brute force.

--
Chuck F ) )
Available for consulting/temporary embedded and systems.
http://cbfalconer.home.att.net USE worldnet address!