Principal Class

Represents a user or group that can be assigned permissions to control security.

Namespace:  Microsoft.SharePoint.Client
Assemblies:   Microsoft.SharePoint.Client.Silverlight (in Microsoft.SharePoint.Client.Silverlight.dll);  Microsoft.SharePoint.Client (in Microsoft.SharePoint.Client.dll)

[ScriptTypeAttribute("SP.Principal", ServerTypeId = "{8a76e712-17a1-4a40-b2df-cca7c060d78f}")]
public class Principal : ClientObject

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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