Begin

All script commands, except for variable declarations, must be inside a begin-end block. Each time the script runs, each block will be evaluated to see if it is valid. If not, the script inside the block will not be run.

Example:

 begin GameMode 

Blocktype	Parameters	Description
GameMode		This will be run every frame while the game is in non-menu mode. Most scripts will use this block type exclusively.
MenuMode	MenuType (optional)	Run every frame while the game is in menu mode.
OnActivate		Run once when object is activated.
OnActorEquip	ObjectID	Run once when the scripted actor equips the specified object.
OnActorUnequip	ObjectID	Run once when the scripted actor unequips the specified object.
OnAdd	ContainerRefID (optional)	Run once when object is added to Container's inventory.
OnCombatEnd		Run once when actor drops out of combat.
OnDeath	ActorID (optional)	Run once when actor is killed by ActorID
OnDestructionStageChange
OnDrop	ContainerRefID (optional)	Run once when object is dropped from Container.
OnEquip	ActorID (optional)	Run once when object is equipped by ActorID.
OnHit	ActorID (optional)	Run once when actor is hit by ActorID
OnHitWith	ObjectID (optional)	Run once when actor is hit by weapon ObjectID
OnLoad		Run once when object's 3D is loaded
OnMagicEffectHit	EffectID (optional)	Run once when the actor is hit by the specified magic effect
OnMurder	ActorID (optional)	Run once when actor is murdered by ActorID
OnPackageChange	PackageID	Run once when actor changes from specified package
OnPackageDone	PackageID	Run once when actor completes specified package
OnPackageStart	PackageID	Run once when actor starts specified package
OnGrab		Run once when the scripted object is grabbed by the player
OnRelease		Run once when the scripted object is released from player grab
OnReset		Run once when scripted object's cell is reset
OnSell	SellerRefID (optional)	Run once when object is sold by specified seller
OnStartCombat	TargetActorID (optional)	Run once when actor enters combat with TargetActorID
OnTrigger		Run each frame something is triggering the object
OnTriggerEnter	TriggeringRefID (optional)	Run once when reference enters the trigger object
OnTriggerLeave	TriggeringRefID (optional)	Run once when reference leaves the trigger object
OnUnequip	ContainerRefID (optional)	Run once when object is unequipped by ActorID.
OnOpen		Run once when the scripted container is opened.
OnClose		Run once when the scripted container is closed.
SayToDone	TopicID (optional)	Run once when actor finishes saying a line of dialogue.
ScriptEffectStart		Special block type used only by Magic Effect scripts
ScriptEffectFinish		Special block type used only by Magic Effect scripts
ScriptEffectUpdate		Special block type used only by Magic Effect scripts
OnFire		Run once when the scripted weapon is fired (New Vegas only)
OnNPCActivate		Run once when object is activated by an NPC (Untested; New Vegas only)
Function	{ Arguments (optional) }	Special block type used only by User Defined Function scripts (NVSE only)

Note that for parameterized blocks, you can have several of the same block type using different parameters. For example, this script is valid:

 begin OnAdd 
    ; some script 
    ; this will run every time this object is added to someone's inventory 
 end 
 begin OnAdd player 
  ; some script 
  ; this will run every time this object is added to the player's inventory. 
  ; Note that the unparameterized OnAdd block will ALSO be run in this case. 
 end 
 begin OnAdd MysteriousChest 
  ; some script 
  ; this will run every time this object is added to the MysteriousChest's inventory. 
  ; Note that the unparameterized OnAdd block will ALSO be run in this case. 
 end