SSI_ENABLE

   (Integrity servers only) This parameter controls the usage of
   system service interception. SSI_ENABLE is turned on by default.

   System Service Interception is a mechanism that allows user
   specified code to run before, after or instead of the intercepted
   system service. This mechanism is available on OpenVMS Alpha
   Version 6.1 and later and OpenVMS Integrity servers Version
   8.3 and later, but the parameter SSI_ENABLE is relevant only
   on Integrity server systems.