Installing Host/EDIT 20.0 and it was understood the RAI Server is optional.
When trying to use Host/EDIT it gives a message
RSV913E - Unable to locate RAI Server RAI0 Version V20000 RC=08
User abend 2,001 dec occurred processing command 'RLXS '.
Release : 20.0
Component : Host/Edit
Currently for the 20.0 GA release of the product the RAI Server is required.
However, this will change with the release of the R20.1 version of the product.
In this release the RAI Server has been completely eliminated.