ActiveX functionality compared to EFS or DDE

[mcubillas]

Does the ActiveX interface provide anything other than the symbol linking, quotes, historical data, time of sales, and order processing functions that are described in the Developer Reference Guide, eSignal Desktop API Edition?

For example, can I fetch the Open Interest, Black-Scholes fair-market value, or the greeks for an option?

Seems to me that ActiveX has less functions available than the EFS (JavaScript) or DDE interfaces which do not carry any additional fees.

[JayF]

Open Interest (dOI) is available under the BarData data structure (page 4-6 for the eSignal Developer Reference Guide.)