Where can I download RH AS2.1 update?

[shen mode <shenmode yahoo com cn>]

Hi,

Execuse me, I'm a newcomer of RH AS2.1.

 We bought a RH AS2.1 which is installed on one of our
servers. I registered at redhat web site and activate
the RH AS2.1 as manual shows. 

As I know there has been some updates for RH AS2.1,
but I don't know whether updation could be done
automatically after registeration ( like WinXP does)
or I need to download those package manually?

If I need to download manually, where could I start my
downloading?

Thanks.

Moore

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