I love the smell of UnrealEd crashing in the morning. – tarquin
Legacy:Effects
From Unreal Wiki, The Unreal Engine Documentation Site
Effects are actors in UT2003 that produce various, well, effects.
There aren't as much subclasses in UT2003 as there are in UT because most visual effects are created with Emitters or xEmitters now.
See Effects (UT) for the UT version of this page.