Schedule User/Role report in background

I am trying to use program RSUSR002 in background mode. I want a list of all users and what roles they have. This is easy in dialog mode. I enter "*" for the Username and "*" in the role name and execute. On the resulting screen I click on the Roles button and there is the report I want. It's not obvious how to run this report in the background, which is what we need. Is there a way to do this?

Thank you,

Steve Ullman