yes either use a trigger zone to activate an animated HUD, that fills the entire screen,
or use decals to create light/heat effects.
I'm sorry I'm too busy to help with a tutorial.
check out the dooruse.fpi script for a look at activating huds, then look in the manual around PG44 for info on other HUD commands.
the gamecore/huds folder is where you can save your huds.
gamecore/decals contains your decals, but you must also create a decal entity in the entitybank/generic/decals folder.
peace
butters
"It's often better to keep your mouth shut and let people think you're an idiot, than to open it and confirm their suspisions" - Noel Coward