After your ABL services are up and running on PAS for OpenEdge, they can be accessed by a variety of client applications.

ABL client applications, which may include GUI, ChUI, and .NET GUI, access service interface procedures through the APSV transport.

REST client applications, which include mobile and web clients, and are built using a variety of technologies such as Kendo UI, Angular, React, etc, access ABL services through either the WEB or REST transports.