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SSI_ENABLE is a system parameter that 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.