Two database with Single Catalog

Hi Experts,
Is it possible to have two databases registered with a single catalog?
My database versions are : 9i & 10g.
The installed database version is 10g.
Please advice & suggest
Thanks & Regards,
MB

I have problem while connecting with the catalog , am trying to connect from 10g catalog to 9i database, but i get the following error.
RMAN> connect target sys@TABS
target database Password:
Recovery Manager incompatible with TARGET database: RMAN 8.0.4.0 to 9.2.0.0 required
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-06429: TARGET database is not compatible with this version of RMAN
Please i need help
Thanks & Regards,
MB

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