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# 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](/excel/rtd/ticker/introduction)**, **[Topic](/excel/rtd/topic/introduction)** and **[Connection Parameters](/excel/rtd/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...)`