VB Enum

Forklar venligst hvad følgende kode gør:
' Use this enumeration to get access to the converted database Fields
Public Enum tTourDatabaseFields
        TurSeq_Field = 0
        TurState_Field = 1
        PrcID_Field = 2
        TurPDDat_Field = 3
        TurPDtme_field = 4
        TurPADat_Field = 5
        TurPATme_Field = 6
        TurRDDat_Field = 7
        TurRDTme_Field = 8
        TurRADat_Field = 9
        TurRATme_Field = 10
        TurMilSt_Field = 11
        TurMilEn_Field = 12
End Enum