RTD Request Structure
The default Excel RTD API library is made up of at least four primary components, with an optional fifth component for those not using a Live TWS session.
The basic components of a the RTD formula are ProgID, Server, Ticker, Topic and Connection Parameters (optional).
While there may be some variety for the other topics, ProgID should always be set to “Tws.TwsRtdServerCtrl” or an equivalent cell, and Server should always be left as an empty string.
=RTD(ProgID, Server, Ticker, Topic, ConnectionParams...)

