Domain Alias - Mount Points

[vs_isp]

Hello people, new guy here,
I was trying to find something about the parked domain/alias and mount points.
So, i have a question. I added a domain and now i want to add another domain as alias to the main domain. Can these two have the same mount point directory? When i add the alias is it possible to write to the "mount point directory" field the same path as the main domain?
I am using version 1.0.7 on Debian 6 with apache2.
Any help would be appreciated, thanks!

*I also read this how-to but i'm not sure what to do: http://blog.nixwind.com/using-domain-alias-with-ispcp