On 06/03/11 20:52, Paul Koning wrote: On which OS? "SDA" exists on more than one. paul On Mar 6, 2011, at 3:45 PM, Mark Wickens wrote: Noticed reading from Hans page that you can use SDA to analyse a system configuration. How do I use that? Mark. Apologies for making assumptions! On VMS, in this case VAX/VMS 7.3 Mark.