Have two Oracle installations in my pc how to choose which one is in work?

Hi,
I have two Oracle installations in my pc, i am not daring to remove one as i dont know which is i am using and which is not.
Because of this i am not able to connect to plsql developer,
Please help me to uninstall one instance.
Thanks,
Vinod

iMussVN wrote:
Just connect to SQL*Plus, write this command to know what instance is working:
select sys_context('userenv','db_home') from dual;
Have fun :)for some weird definition of "fun"!
bcm@bcm-laptop:~$ sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Sun Jun 3 21:02:22 2012
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Enter user-name: / as sysdba
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
21:02:25 SQL> select sys_context('userenv','db_home') from dual;
select sys_context('userenv','db_home') from dual
ERROR at line 1:
ORA-02003: invalid USERENV parameter
21:02:27 SQL>

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