I installed Oracle 12c on windows using all the defaults but choosing to use a pluggable database and to install the sample data. The container database and SID name is ORCL and the pluggable database is PDBORCL.
I noticed that using SQL Developer I can connect to the pluggable database by using its name as the service name. Also I can connect to the container database using its name either as SID or service name.
Looking at my tnsnames.ora I found that only ORCL is mentioned as a service name. Does oracle register pluggable databases as service names automatically or there is a configuration file that I am missing?