Oracle8i, RHEL4. RMAN not use catalog.

I have done backup use RMAN at host_A (path /oracle).

rman target / nocatalog log rman_full_backup.log < run
{
allocate channel ch00 type disk;
set limit channel ch00 kbytes = 100000;
backup database format='/oracle/%d_DB_%u.rman';
sql 'alter system archive log current';
backup current controlfile format='/oracle/control.rman';
release channel ch00;
}
EOF

I have copy this files to another host_B to the another path (/oracle2)

And I want to recover this DB to another place and I do not know how can I indicate to RMAN where it find this file "%d_DB_%u.rman" ????

run
{
allocate channel ch00 type disk ..............;
.................
set newname for datafile ........
............
}
P.S. I am sorry my bad English.