{ This is the first 16 bits, the same as the FIRST bit screen. }
Gettable item:
  Artifacts, mana and health have this bit set.
  If things have got this flag, walking into them
  will make you 'pick up' the item. If you put this
  on a monster/projectile (i.e, anything but the normal
  things), hexen will jump to dos.

Obstacle:
  Pretty obvious...If a thing have got this bit on, walking
  into it will cause the player to stop, unless the thing
  is so small you can step over it. The max height should be
  24, and the max height you can jump over should be 32.

Shootable thing:
  Controls if you can kill the thing.

Total invisibility:
  With this on, the object can't be seen.
  Not at all.

Can't be hit:
  Projectiles will fly right through the object.
  And as far as i remember, the object won't
  take damage from crushing things, either.

Semi-deaf:
  It worked to SOME degree in doom, but
  it doesn't seem to have any in hexen?

In pain:
  This bit is not known, nor was it in doom.
  The 'main theory' about it is that it is
  used internally...For god-knows-what-reasons.

Steps before attack:
  Haven't tested properly.
  It's something like 'the monsters move frame gets
  displayed just before it's attack frame'...Or?

Hangs from ceiling:
  Normally, monsters, items and the like stands/lies
  on the floor when you start a level. With this on,
  they start just below the ceiling instead...Try
  to put this on a ettin and warp to level 1...

No gravity:
  If you want to have a flying monster, set this bit.
  If you don't and it has got floating, it will seem
  to 'jump' up and down wery rapidly.
  <note: DONT try to put this on the player>

Travels over cliffs:
  You know, if you put a ettin on top of a relatively high
  pillar, it wont jump down. If the pillar is only 24 (32?)
  units heigh, it can jump down. If you put TOC on a monster,
  it will sometimes seem to 'jump into it's own death' because
  they are then allowed to cross 'steep sectors'. The player has
  got this on, of course. Unfortunately, it doesn't mean 'fly over
  cliffs'...

Picks up items:
  Remove this from the player, and see your friends reactions...
  They will move into, say, timons axe, and they can't pick it
  up. They turn around and try again...Wery fun! Basically:
  If it's on, the player can pick up items with the 'gettable item'
  flag. But if that item have got a initial frame that is not
  one of the 'item/artifact/weapon' frames, hexen will quit...:-(

No clipping:
  Not exactly...
  The thing will move through objects, if they hit a wall,
  where you would be able fly on top normally, the thing
  would jump right there. If they hit a solid wall, they
  will stop, though.

Slide along walls:
  As far as i know, it was totally unused in doom.
  It doesn't seem to have any effect.

Floating:
  If a monster have got this bit (AND no gravity),
  it will be able to fly, like, say, the dark bishops
  and the death wyvern, wraiths, and stuff.

Semi no clipping:
  Like no clipping, but the thing will also
  stop if it hits an object.

Projectile:
  Well, if you want a 'missile' wich can fly through the air,
  and explode when it hits something, this is the key.
  It basically just plays the things deathframe when it hits
  a wall or monster, and make the thing die. Note that
  projectile speeds are MUCH greater than normal speed.

Partial invisibility:
  You will be able to see some of the object, and
  some of the background THROUGH the object.

Transparancy:
  Wery much like partial inviso.
  You can see more of the background,
  but i can't spot any more differences.

Puff VS bleed:
  In doom, this controlled if a hit on an object
  should result in blood splats or bullet puffs.

Sliding helpless:
  One more unknown, that is also unknown and probably
  unused in doom...

No auto-levelling:
  In doom this controlled if floating monsters were supposed to
  get on level with you before shooting.
  Example: You walk a little, the you suddenly see a cacodemon.
  Normally, the cacodemon would float down until it where at the
  same height as you. With this off, it would just start shooting.
  I dunno if it's the same in hexen, though.

Affect kill-%:
  Well, there's no kill/score/items ratio any more, so this
  is pretty useles...NOT! If a thing has got this on,
  it will die when you type the hexen 'massacre' code. Note
  that i have used the HERETIC, not the hexen code here...
  If you wanted to know the cheatcodes, you wouldn't have
  downloaded this ;-)

Affect item-%:
  NO IDEA! In doom, when you picked up a
  thing with this bit on, the item% would
  increase a little, but there are no ratios
  in hexen...

Running:
  I think it is used internally, maybe
  it isn't even used, or maybe for something
  else.

Not in deathmatc:
  Some thing have this bit on, for example the
  player. Otherwise, all players would run around
  looking the sam when in deathmatch...I think :-)

Color 1/Color 2:
  These two bits are used two select between
  various color combos...The best way to find
  out what i mean is to try them out.