DBError_busov等语句的意思

                    DBError_busov.TopColor = &HFF00&        
                    DBError_IPM.TopColor = &HFF00&
                    DBError_ovcur.TopColor = &HFF00&
                    DBError_lv.TopColor = &HFF00&
                    DBError_controt.TopColor = &HFF00&
                    DBError_buslv.TopColor = &HFF00&
                    DBError_ovspeed.TopColor = &HFF00&
                    DBError_ovload.TopColor = &HFF00&   DBError_busov
  DBError_IPM.
  DBError_ovcur....都是什么意思