Can I use username = system when I log into SQL plus?

I am new to Oracle and SQL plus and I have some questions to ask?
I managed to get SQLPlus working using  sqlplus system/password
When I installed Oracle I created a database called ORCL and set a  password.  My question is when I am using SQL Plus is it OK
to use username= system.  The problem is that I created 3 tables in this database but when I list the tables I get about 181 tables returned.
It seems that I have  logged into the master database.
In fact I just used the password I set when I  installed Oracle (not the @asi past)
from:
http://docs.oracle.com/cd/E13212_01/wles/docs42/installadmin/database.html
Configuring an Oracle Policy Database
To configure an Oracle policy database, you must create the policy database, create a security role and a user, and grant the security role and user access.
To configure a policy database, perform the following steps:
Open a command window, run the Oracle SQLPlus utility, and login as user SYSTEM with the password you set for that user account when you installed the Oracle database software.
sqlplus system/password@asi
where: password is the password you set for the system account when you installed the database software and asi is the database instance name.
The name of the database I set up when I installed Oracle was ORCL.
I can set up a data source using WebLogic Server Administration Console using  the following data:
Database name:             ORCL
Host name:                      localhost
Port:                                 1521
Database USer Name:   System
Password:                        the password I set when I installed Oracle
This is different form the book I am using where the writer used the database name XE as in the following:
Database name:             XE
Host name:                      localhost
Port:                                 1521
Database USer Name:   OE
Password:                        .......
Confirm Password:        .......
Anyways I managed to create some tables  using SQL script.  I assume these are in the ORCL database. 
SELECT TABLE_NAME FROM USER_TABLES  will list all the tables in the database.
Apparently there are a lot more tables in this database (181 tables) than I thought.  I have only created  3 tables.
Article
Section
Edition
Is this how it should be?
Also I am trying to create another table Catalog  but SQLPlus is not allowing me to do this!
ERROR at line 1:
ORA-00955: name is already used by an existing object
Next I create an EJB project using Eclipse (Oracle Enterprise Pack for Eclipse).   Then
I add a JPA (Java Persistence API) project facet.  In this I  specify the following:
SID:                         ORCL
Host:                       localhost
Port Number:       1521
User name:            System
Password:               The password I set when I installed Oracle.
Here there is a GUI called Select tables which gives a list of tables I assume the same list of table
I had listed in DOS however there appears to be more tables here. 
Anyways,  I am just wondering am I on the correct path and would this Database I am using be the
ORCL database.  Would all these tables be tables that are in the ORCL database?
Thank you in advance for your help.
Brian.

Hi Shannon,
Thanks for visiting Apple Support Communities.
You can sign in to another iTunes Store account on your Nan's iPad by following the steps in this article:
iOS: Changing the signed-in iTunes Store Apple ID account
http://support.apple.com/kb/ht1311
Best,
Jeremy

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