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From Unreal Wiki, The Unreal Engine Documentation Site

Object >> Player >> Viewport (native-only)

Package: 

Engine

This class in other games:

UT, UT2003

The player class for local players. Since it is a purely native class, it does not expose any additional members for use at the UnrealScript level.

[edit] Usage

The most common use for this class in custom UnrealScript code is to check whether a certain PlayerController belongs to the local player by typecasting its Player variable:

if (Viewport(SomePlayerController.Player) != None) {
  // SomePlayerController is the local player
}

Since splitscreen mode is not supported, there can be only a single PlayerController whose Player variable references a Viewport object. On a dedicated server there is never any local player.

[edit] See also

• NetConnection - the player class for remote players
• LevelInfo.GetLocalPlayerController() - returns the local PlayerController (if any)