From Valve Developer Community
- Fired if this object is spawned on the map. If the weapon is removed during the weapon spawn pass, this will not fire.
- These Outputs each fire in response to the firing of the like-numbered
FireUser4Input; see User Inputs and Outputs.
OnKilled(Only in the Left 4 Dead series)
- This Output fires when the entity is killed and removed from the game.
- Fired when this object catches fire.