1) Host A has the below

Services Summary...
instance_1 has 2 service handler(s)
instance_2 has 2 service handler(s)
instance_1 has 1 service handler(s)
instance_1 has 2 service handler(s)
instance_1 has 2 service handler(s)
instance_2 has 2 service handler(s)
instance_2 has 2 service handler(s)

a) both instances has the same port number.
b) in my listener configuration, i have only the instance_1 configuration.
c) both instances share the same oracle user


Questions
i) I am puzzled by the list of services summary as shown above.What does it mean?
ii) in my listener configuration, i have only the entry for instance 1. And i have checked that when i su to the oracle user , the instance is instance_1.