WDSC: Remote System Explorer Introduction The Remote Systems Explorer (RSE) is the development environment within WebSphere Development Studio Client that allows you to develop RPG, COBOL and CL applications. This development tool is the 21st century follow-on to the world of SEU, SDA, PDM, etc and even CODE/ 400. All the things that a developer might wish were possible with a green screen are in the RSE and some that you haven't even thought of yet! Other benefits include improving programmer productivity, off-loading host development workload and allowing existing applications to be maintained more effectively.