Oracle Network Administration - Oracle 10g Database Administration Concepts and Implementation Made Simple - page 211

Fill in the three text boxes with the same information you used at
the time of creation of database. The Database name i.e. Global
Database Name. In our case it is takveen. Moreover provide the
location of Oracle Home directory and the name of SID i.e.
takveen in our case. Once done, this is very important, do not
forget to click “File” and then “Save Network Configuration” as
only saving the configuration generates the listener.ora file. Once
we start the listener process it will configure itself according to
the configuration contained in the listener.ora file.
Figure 8-13: It's not recommended that you create the listener.ora file
using text editor. Always use ONM as it's programmed to produce
listener.ora file exactly in same format required by listener process. The
sole purpose of the listener process is to listen to the connection
request.
Next thing is to start the listener. The listener process can be
started using lsnrctl utility both in Windows Server and Unix
environment. You can also run in windows environment by
clicking
Start>Settings>Control Panel>Services