struct SECURITY_CLIENT_CONTEXT

typedef struct _SECURITY_CLIENT_CONTEXT
{
     SECURITY_QUALITY_OF_SERVICE SecurityQos;
     PVOID ClientToken;
     UCHAR DirectlyAccessClientToken;
     UCHAR DirectAccessEffectiveOnly;
     UCHAR ServerIsRemote;
     TOKEN_CONTROL ClientTokenControl;
} SECURITY_CLIENT_CONTEXT, *PSECURITY_CLIENT_CONTEXT;

Windows Vista Kernel Structures