These are the Application Object's which Visual LANSA makes available. They are a selection of primitives where a runtime instance of the primitive is programmatically available to use in your application. These instances are identified with a SYS_ prefix and include:
Refer to 13. Processing Messages (SYS_MSGQ)
The SYS_THEME is typically only used in the BEGIN_COM of a Web Page or Theme to nominate the base theme to be applied. Refer to 5.1 Themes for more information.