Enabling the multiple execution of the script when
the start trigger is met.
The action can be only used within the context
of an object of Event type.
After the script start (from arbitrary occasion), when the
starting trigger is met, there is automatic disabling the start of
another instances of the given script, while all instances are not to be
terminated. This feature may be avoided, if the script (its arbitrary
instance) will execute the action ENABLE. From this moment, scripts will be
started when the starting trigger will be met.