Unable to connect to Forms and Reports

Hi,
I'm unable to connect to Forms and Reports. I have done the following installations.
1) First I have installed oracle 9i database in C:\oracle. oracle schema is devlp
I was able to connect to database at scott/tiger@devlp
2) I have downloaded oracle forms and reports from oracle site and installed.
When installing forms and reports, the directory "oracle" is already in use message popped. So changed the path to C:\oraforms and installed both forms and reports.
3) After installation, i tried to connect to forms/reports but couldnot connect. Error TNS could not connect.
4) When i checked the TNSNAMES.ORA, the DEVLP string is available.
Where should i changed the tnsnames??????
Please anybody let me know how to have correct tnsnames and where.
Thanks in Advance
Chettarjee

Mr. Sybrand,
Thanks for the reply and I understood your point. Can you please further guide me to get an appropriate Oracle Forms/Reports (Developer) version in order to make application using Oracle Database 10g. Please note that most of my experience is in D2K 2000 rel:6. and unfortunately I came into software development after a long gap that is why not much aware about latest version out there of Oracle Forms/Reports.
But is there really no way to connect D2K rel:6 with DB 10g !!!
Regards,
Zia

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Edited by: Krithi on 06-Jul-2009 01:55

hi gregor13, Thanks a lot for the second suggestion, it worked and I am able to run the form locally now
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I have defined a parameter list called plid
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