Use of Hostname for connectivity through client in 10g

Hi,
Can anyone please clarify the use of host name and DB name? I mean currently we are using Oracle 8.0.5 where clients are connecting to Database using the hostname for e.g "Dataserver"... but now we are planning to migrate our DB to 10.2.0.1 where in testing phase when we created database with same name i.e "Dataserver" oracle doesnt allow this as giving error that DB name cannot b same of host name... now i want to know is there any possibility in 10g that we can use host name for connecting to DB through clients?
this question requires urgent attention as we need to migrate our database as early as possible.
thanks

while connecting to sql i m using:
SQL> connect sharjeel/a@dar-dev-002
ERROR:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
output of lsnrctl stat:
LSNRCTL for 32-bit Windows: Version 10.2.0.1.0 - Production on 26-SEP-2011 17:15:18
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Produ
ction
Start Date 26-SEP-2011 14:52:33
Uptime 0 days 2 hr. 22 min. 48 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File D:\oracle\product\10.2.0\db_1\network\admin\listener.ora
Listener Log File D:\oracle\product\10.2.0\db_1\network\log\listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dar-dev-002.AKHST.org)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl_XPT" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully

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