The application data structure (ADS)

Application data structure (ADS) is another name for the symbolic map that is generated by the BMS macros used to define the mapping of the 3270 screen.

For BMS programs, terminal data is passed between the client and the bridge in this format, giving the client application a simplified interface to the terminal data, without the need to understand 3270 data streams.

See DFHBMSUP for guidance on creating the ADSD if you have no source.