In Eikon Excel, you can use functions such as AdStyleStructure to return get details of styles. For example, you can use AdStyleAttribute("CUR","JPY","QM") to determine if Dollar/Yen is quoted directly or indirectly. Within App Studio, what is the equivalent method to access this type of information. (Styles can also be used to access holiday calendars, bond structures, swap conventions, ...) The functions I am referring to are Adfin functions.
The only Eikon API that provides this capability is the AdfinX Analytics COM API, which cannot be used in App Studio. You could however easily implement this capability yourself. Take m_public.dat file from Eikon, put it on the Web server hosting the app and develop a custom routine to parse the file and return whatever data you're interested in. The file on the Web server will not update automatically, so if you'd like to maintain the latest version of the file, you could conceivably periodically copy updated file from Eikon machine to the Web server.