Second Life includes many events that a script can register to process. These events are listed here.

at_rot_target( integer tnum, rotation targetrot, rotation ourrot )

at_target( integer tnum, vector targetpos, vector ourpos )

attach( key id )

changed( integer change )

collision( integer num_detected )

collision_end( integer num_detected )

collision_start( integer num_detected )

control( key id, integer level, integer edge )

dataserver( key queryid, string data )

email( string time, string address, string subj, string 
	message, integer num_left )

http_response( key request_id, integer status, list 
	metadata, string body )

land_collision( vector pos )

land_collision_end( vector pos )

land_collision_start( vector pos )

link_message( integer sender_num, integer num, string str, 
	key id )

listen( integer channel, string name, key id, 
	string message )

money( key id, integer amount )

moving_end( )

moving_start( )

no_sensor( )

not_at_rot_target( )

not_at_target( )

object_rez( key id )

on_rez( integer start_param )

remote_data( integer event_type, key channel, key 
	message_id, string sender, integer idata, 
	string sdata )

run_time_permissions( integer perm )

sensor( integer num_detected )

state_entry( )

state_exit( )

timer( )

touch( integer num_detected )

touch_end( integer num_detected )

touch_start( integer num_detected )