typedef struct _SEP_LOGON_SESSION_REFERENCES
{
     PSEP_LOGON_SESSION_REFERENCES Next;
     LUID LogonId;
     LUID BuddyLogonId;
     ULONG ReferenceCount;
     ULONG Flags;
     PDEVICE_MAP pDeviceMap;
     PVOID Token;
     UNICODE_STRING AccountName;
     UNICODE_STRING AuthorityName;
} SEP_LOGON_SESSION_REFERENCES, *PSEP_LOGON_SESSION_REFERENCES;

Windows Vista Kernel Structures