You will of course need shockwave installed, was quite impressed by this Shockwave FPS Apologies if its a repost...... Njoy (Edit for flash/shockwave correction, my excuse, a head cold!)
Put it in full-screen mode and it's just like any other game, command-line console and everything. Needs decent levels and MP now, but shows what you can do <A88>
Like Alex said, stick it in fullscreen. Could easily pass for a beta/older version of any of the Unreal line...I'm impressed .