RTD() symbology
RDT() function support multiple asset classes and instrument symbology. For more information about instruments type, please go to Instrument Symbology.
InstrumentCode
The InstrumentCode is set in the 3rd parameter. The 2sd (server) and the 4th parameters are blank or empty string.
=RTD(ProgID,,InstrumentCode,,Field[,Level])
=RTD("ontrade.quotes",,"SSE:ELISA",,"last")

VWDInstrumentCode
The VWDInstrumentCode is set in the 3rd parameter. The 2sd (server) and the 4th parameters are blank or empty string.
=RTD(ProgID,,VWDInstrumentCode,,Field[,Level])
=RTD("ontrade.quotes",,"BN.FR",,"last")

Feed + Ticker (DEPRECATED)
3rd and 4th parameters of the function are needed.
=RTD(ProgID,,Feed,Ticker,Field[,Level])
=RTD("ontrade.quotes",,"SSE","ELISA","last")