[CentOS] centos 5 GUI disable update agent upper right

Fri Apr 20 17:51:55 UTC 2007
Jerry Geis <geisj at pagestation.com>

How do I disable the update agent in the upper right corner on centos 5?

I am looking for a command line way to do this.  I know I can right 
click on it and select quit.

THanks,

Jerry