Configuring Data Guard on 2 different instance in same machine

Hi All,
I am new to the Data Guard concept. I am using Oracle 10g (Release 10.2.0.1.0) in Windows 7 environment . I have created 2 database instance its running fine.
For testing purpose, Is it possible to implement Data Guard concept between 2 instance in the same machine? whether it will impact any problem?
Thanks & Regards
Sami.

You would use the same one. That is, you would not have a separate tnsnames.ora and listener.ora.
What I was trying to say is you still need to add the SID_LIST_LISTENER lines that Data Guard uses
Example
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0)
(PROGRAM = extproc)
(SID_DESC =
(global_dbname = PRIMARY_DGMGRL.uservices.umn.edu)
(ORACLE_HOME = /u01/app/oracle/product/11.2.0)
(sid_name = PRIMARY)
TNS Example
STANDBY =
(DESCRIPTION =
(SDU=32767)
(SEND_BUF_SIZE=2092500)
(RECV_BUF_SIZE=2092500)
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = HOSTNAME)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = STANDBY)
Best Regards
mseberg (Its very late here)

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    6. check all TNS connectivity to both instances using the SYS as sysdba, Use the TNS sqlplus sys@db as sysdba. Do this connection from both hosts if using more then one host.
    If you have verified all this and it is still not working let me know and we can move on to next steps.

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