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UE2:Actor

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UE2 Object >> Actor
Known custom subclasses:
Round_Robin, PawnFactory, IncrementalTrigger
This class in other games:
RTNP, U1, UT, UE2Runtime, UT2003, U2, UT2004, U2XMP, UT3, UDK

The (usually abstract) base class for about anything that is visible or can be interacted with in a level.

See the various game-specific classes for details. Subclasses linked above are mostly articles about generic custom classes for Unreal Engine 2 games.