How to restore specific backup file from RMAN?

Hi,
I am just begginer with Oracle DB so I do not have a lot knowledge.
I created two backups at April the 8th and April the 10th.
I did following from RMAN.
shutdown immediate
startup mount
configure channel 1 device type disk format '/opt/oracle/backup/std_%U';
backup database
startup
output was:
including current control file in backupset
including current SPFILE in backupset
it created two files: std-0so6l0vn(2 GB) and std_0to6l106 (7 MB).
First question - first file is backup and what is the second file???
Today I created also backup and it also created two files: std_0uo6morg (2GB) and std_0vo6morv (7MB)
Now I want to return backup from 2 days ago (*std-0so6l0vn*) but can't;
I do the the following:
shutdown immediate
startup mount
restore database from '/opt/oracle/backup/std_0so6l0vn'
but getting error - only SPFILE or control file can be restored from autobackup.
How to restore my backup from two days ago? It looks to me so complicated and hardly understandable.
What command to execute from RMAN to succeed in restore?
Thank you

I still can not restore database; I tried Honza method.
i try
startup nomount
restore controlfile from 'restore controlfile from /opt/oracle/backup/sss_11o7efd9_1_1';
And getting message:
no autobackup found or specified handle is not a valid copy or piece
list backup returns:
BS Key Type LV Size Device Type Elapsed Time Completion Time
19 Full 6.80M DISK 00:00:01 19-APR-13
BP Key: 19 Status: AVAILABLE Compressed: NO Tag: TAG20130419T025522
Piece Name: /opt/oracle/backup/sss_11o7efd9_1_1
Control File Included: Ckp SCN: 3178467 Ckp time: 19-APR-13
SPFILE Included: Modification time: 02-APR-13
show all returns:
RMAN configuration parameters are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION OFF; # default
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP OFF; # default
configuration for DISK channel 2 is ignored
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '%F'; # default
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE CHANNEL 1 DEVICE TYPE DISK FORMAT '/opt/oracle/backup/sss_%U';
CONFIGURE CHANNEL 2 DEVICE TYPE DISK FORMAT '/opt/oracle/backup/sss_%U';
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/opt/oracle/product/10.2.0/dbs/snapcf_ctginst1.f'; # default
Please help I really must restore database but can't do it.

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How to restore specific backup file from RMAN?

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