AppServer or Progress Application Server session — Using the CURRENT-REQUEST-INFO and CURRENT-RESPONSE-INFO attributes on the SESSION system handle
ABL client session — Using the REQUEST-INFO and RESPONSE-INFO attributes on the server object handle used to invoke the remote request, and on the asynchronous request object handle returned for an asynchronous request
The *REQUEST-INFO attributes provide version information for the associated AppServer or Progress Application Server client; the *RESPONSE-INFO attributes provide version information for the associated AppServer or Progress Application Server.