RTD (Real Time Data) is a feature introduced with Excel 2002 to display data provided by an RTD server. For questions regarding real-time data outside Excel choose the tag 'real-time-data'.
RTD (Real Time Data) is a feature that has been introduced with Excel 2002. It provides the ability to display data in real time within the sheet. The data is provided by a so-called RTD server (not to be confused with a hardware server), which is an external program that binds through an IRTD interface that's based on COM interaction.