How is Agent cmd line built when pulling Agent from URL?

Good afternoon,

I am curious if anyone knows what is actually happening with regard to the cmd line when pulling the 7.1 agent from a url? We use an alias for each SMP (SMP01, SMP02, ect) so that we can easily redirect if necessary in the event of a DR event. This was done correctly when we migrated our clients from 6.x.

 I just realized that when we do one off re-installs we are installing with a cmd line that writes the actual server hostname in. So on to my question

- Is this cmd line being auto generated when the request is made? (If so can I change it?)

or 

- Is this cmd line fixed and just sitting in a script in the package that we can modify with the Alias name?

Tanka

DCHAD