  Determining which ECOs have been installed? 
 The Question is:
 
How can I find out what vms software patches
have been installed on our system.
We are running OpenVMS v5.5-2H4
 
 
 The Answer is:
 
  There is no reliable mechanism on OpenVMS VAX, other than looking
  up the kit release notes files for the kits in SYS$HELP:.
 
  On OpenVMS Alpha, use the SYS$UPDATE:VMSINSTAL.HISTORY file and
  the PCSI PRODUCT commands.
 
  In OpenVMS Alpha V7.1-2 and later, OpenVMS ECO kits change over to
  PCSI installations -- these kits will not be installed with VMSINSTAL,
  and will not be listed in SYS$UPDATE:VMSINSTAL.HISTORY.  (Use the
  PRODUCT SHOW PRODUCT/FULL and PRODUCT SHOW HISTORY/FULL commands.)
 
  On an OpenVMS VAX release after V7.2, OpenVMS VAX VMSINSTAL will
  likely be extended to provide support for a VMSINSTAL.HISTORY file.
 
  Compaq services offers a service that can inventory the software
  installed on a system, if that is of interest.
 
