Problem running multiple instances

Hi,
I want to run two instances of an existing database, means database created long ago now I want to start another instance of the database.I have modified instance_name(=tcslocal) paramater for the first instance which is still running fine and for the secend instance the parameters are like below:
db_domain=world
db_name=TCSlocal
Instance_name=10glocal
But when I am trying to up the second instance using "startup pfile=<path>"
it is some time giving the error "ORA-01102: cannot mount database in EXCLUSIVE mode" and sometime throwing "ORA-00205: error in identifying controlfile, check alert log for more info" and so I failed to start to start the second instance.
Please provide me a solution.
Thanks in advance,
Koushik

Hi,
I have created contron files, but I should not create the datafiles because I want to share all the datafiles. After creating control files I overcame the previous error but the current error showing in alert log is :
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\SYSTEM01.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\UNDOTBS01.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 3 - see DBWR trace file
ORA-01110: data file 3: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\SYSAUX01.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: 'C:\ORACLE_HOME\ORADATA\USERS01.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\EXAMPLE01.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 6 - see DBWR trace file
ORA-01110: data file 6: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\APPL_DATA.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 7 - see DBWR trace file
ORA-01110: data file 7: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\APPL_INX.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 8 - see DBWR trace file
ORA-01110: data file 8: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\HTML_DB.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 9 - see DBWR trace file
ORA-01110: data file 9: 'C:\ORACLE_HOME\ORADATA\TRDB_DATA1.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 10 - see DBWR trace file
ORA-01110: data file 10: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\BIP_DATA1.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 11 - see DBWR trace file
ORA-01110: data file 11: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\BIP_INDEX1.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
ORA-01157: cannot identify/lock data file 12 - see DBWR trace file
ORA-01110: data file 12: 'C:\ORACLE_HOME\ORADATA\TCSLOCAL\FLOW_1.DBF'
ORA-27086: unable to lock file - already in use
OSD-04002: unable to open file
O/S-Error: (OS 5) Access is denied.
Can any body please specify how can I share all this datafiles.
Thanks in Advance,
Koushik

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