enum LSA_FOREST_TRUST_RECORD_TYPE

typedef enum 
{
         ForestTrustTopLevelName = 0,
         ForestTrustTopLevelNameEx = 1,
         ForestTrustDomainInfo = 2,
         ForestTrustRecordTypeLast = 2
} LSA_FOREST_TRUST_RECORD_TYPE;

Windows Vista Kernel Structures