Purpose of  exporting  env variable arguments when issusing .oraenv command

Hello to all ;
i have little bit confusion using export keyword when issusing .oraenv command.
I am not using that method. I using following method to be able to switch between databases.
In my oratab file : i have following DB ..
testdb:/u01/app/oracle/product/10.2.0/db_1:N
dummydb:/u01/app/oracle/product/10.2.0/db_1:N
+[oracle@localhost ~]$ echo $ORACLE_SID+
dummydb
+[oracle@localhost ~]$ . oraenv+
+ORACLE_SID = [dummydb] ? testdb+
+[oracle@localhost ~]$ sqlplus /nolog+
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Feb 12 21:49:00 2013
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
SQL> conn /as sysdba
Connected.
SQL> select name from v$database;
NAME
TESTDB
Above mentioned output  clearly shows i am not confusiing with oraenv concepts.
but i am having little bit doubt and confusion using export keyword when issusing .oraenv command.
can anyone assist me ? => purpose of using export keyword when using .oraenv
REF_LINKS :http://www.acehints.com/2012/06/purpose-of-oraenvaskno-yes-variable-in.html
Product :10g R2
OS : RHEL

Lot of things need to learn in oracle .. i dont understand from this link ..
http://www.lmgtfy.com/?q=unix+environment+variable+scope
One more Question :
I created some manual databases previously. i did n't fill oratab file for manual databases.
when i was issuing $ export ORACLE_SID=<sid_name>
i can connect with my database.
Now i have two databases in my machine. Both done by DBCA
I deleted dummydb entry from /etc/oratab file;
Now i tried to switch DB from my machine. i cant connect without setting home path for dummydb.
If i set home path i can connect with dummydb.
OK.  I hope  dbhome utility is checking home path for given SID.
My question : * Why i am getting error which was created by DBCA ?*
+$ export ORACLE_SID=dummydb+
+[oracle@localhost ~]$ sqlplus /nolog+
bash: sqlplus: command not found
DBCA databases throwing error. ( if entries removed from oratab );
Manual databases not throwing error. ( Although no entry in oratab) ;
Thanks ..

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