Installing 9 after 10 breaks 10?

Question

Hello folks,
I had a working version of XE (poor man's 10g) running on my dev box. Recently i also needed to develop for 9i so I installed that. I can now use the 9i but it seems to have broken my XE setup. I'm not an Oracle wiz but I think both versions should be able to coexist. However...
When connecting to a database in XE (using SQL Developer) I get this message: "TNS:listener does not currently know of SID given in connect descriptor"
I've been Googling for this for a few hours and tried to fix this but it hasn't worked.
I posted the contents of the tnsnames.ora file from the Oracle 9 home at the bottom of this email. As can be seen I added a configuration for XE. I noticed it's all using the same port (1521). Is that OK? If not, can this be changed after installation?
Also when I run "lsnrctl services" from c:\ I don't see any XE services. When I run "lsnrctl services" from my Oracle XE home I get a few errors and then the services running from Oracle 9. Results are pasted below.
Also I pasted my listener.ora file from the Oracle 9 home.
I have tried adding configuration data to the listener.ora and the tnsnames.ora (and removed it) but that wasn't doing anything.
Any help or clarification on this would be very much appreciated.
Thanks,
Vincent.
tnsnames.ora from Oracle 9 home:
ORACLE9I.INTERNAL.ISSPL.COM.AU =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = koopman)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = ORACLE9i)
EXTPROC_CONNECTION_DATA.INTERNAL.ISSPL.COM.AU =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
INST1_HTTP.INTERNAL.ISSPL.COM.AU =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = koopman)(PORT = 1521))
(CONNECT_DATA =
(SERVER = SHARED)
(SERVICE_NAME = MODOSE)
(PRESENTATION = http://HRService)
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = koopman.internal.isspl.com.au)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
Output from c:\lsnrctl services
LSNRCTL for 32-bit Windows: Version 9.2.0.1.0 - Production on 01-OCT-2008 11:38:
32
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC0)))
Services Summary...
Service "EX" has 1 instance(s).
Instance "EX", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Service "ORACLE9i" has 2 instance(s).
Instance "ORACLE9i", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Instance "ORACLE9i", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
Service "ORACLE9iXDB" has 1 instance(s).
Instance "ORACLE9i", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: KOOPMAN, pid: 3088>
(ADDRESS=(PROTOCOL=tcp)(HOST=koopman.internal.isspl.com.au)(PORT=1086))
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
The command completed successfully
Output from C:\oraclexe\app\oracle\product\10.2.0\server\BIN>lsnrctl services
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
*32-bit Windows Error: 2: No such file or directory*
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=koopman.internal.isspl.c
om.au)(PORT=1521)))
Services Summary...
Service "EX" has 1 instance(s).
Instance "EX", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Service "ORACLE9i" has 2 instance(s).
Instance "ORACLE9i", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Instance "ORACLE9i", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0 state:ready
LOCAL SERVER
Service "ORACLE9iXDB" has 1 instance(s).
Instance "ORACLE9i", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: KOOPMAN, pid: 3088>
(ADDRESS=(PROTOCOL=tcp)(HOST=koopman.internal.isspl.com.au)(PORT=1086))
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
The command completed successfully
listener.ora from Oracle 9 home:
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = koopman)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\ora90)
(PROGRAM = extproc)
(SID_DESC =
(GLOBAL_DBNAME = ORACLE9i)
(ORACLE_HOME = C:\oracle\ora90)
(SID_NAME = ORACLE9i)
)

Answer 1

Can the two versions operate on the same machine at the same time? My application uses one DB on 9i and one on 10g. Shutting down one of their listeners would only work if one listener can handle requests for both DB's no?