Can somebody explain this to me:

example:
RMAN> RUN
{
SET UNTIL SEQUENCE 11 THREAD 1;
DUPLICATE TARGET DATABASE TO "clone" NOFILENAMECHECK;
}

In particular how do you know what SEQUENCE and THREAD to put into the
command, is there a query to run.

Secondly, where will the files be placed Ie control files, system.dbf, redo logs.... or is this just a snippet and there has to be more setup before
this is run. Ie create init.ora...

What will the new database name be "clone"