How to switch DB string storage format from/to UTF-8 to/from ISO 8859-1 ?

As far as I understand strings in tables are stored by default in an Oracle DB in ISO 8859-1 format.
How can I switch the storage to UTF-8 format?
Do I have to change just a parameter (which ?) or do I have to setup/install the whole DB again?
If just a parameter switching is necessary:
How can I change already existing strings from one format to another?
Does it take place automatically or do I have to issue and explicite convert command (which ?).
Peter

Please refer to
http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch2charset.htm#sthref157
And
http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch11charsetmig.htm#sthref1476
Sybrand Bakker
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Attachments:
NI-forum.7z ‏33 KB

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