Answer / rony

simply saying it is used to communicate between the os &
database i.e. when user sends a request it listens to it and
in turn sends it to database to answer.
The status of listner can be seen as fallows
ora<sid>:lsnrctl -status
or
<sid>adm:execute r3trans -R, then a log file is created named
as trans.log there u can see the status listner.

Answer / joshua

lsnrctl -status

or

Start--> Run--> Services.Msc--> check for listner.. If it
shows running then Listner is up & running.

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