>But I think  it could be of  interest to the VM community  in general to
>list (some of) the incompabilities.
 
The  point is,  it's  not as  much a  problem  of revealing  confidential
information as of  remembering what the heck  it is that I  had to change
and where. The SFBLOK business was  definitely not a problem, nor was the
extra line  in CP Q V  ur. But the extra  digit in the device  number did
break one of the modules, for example.
 
  Eric