NPC (Command)
The NPC command has a number of parameters which effectively are separate NPC related commands.
Spawn
Spawn NPCs in front of the player using the following syntax:
npc spawn [npc type] [optional name to use for the npc]
The optional name is used to target the NPC with other commands and scripts.
Spawn Vehicle
Much the same as npc spawn, only to spawn a vehicle:
npc spawn vehicle [vehicle type] [optional name to use for the vehicle]
Kill
Kill all spawned NPCs (including vehicles):
npc kill all
If the player decides to name an npc (or vehicle) by adding the optional name field, or the NPC was given a name by a script or map, the player can kill the npc with a simple command:
npc kill [optional name specified at spawn]
Showbounds
Toggles bounding boxes of all NPCs.
Score
Prints the score that each NPC in the world has. You can optionally specify an NPC that was given a script_targetname.