The button to the right of the listed server will delete the virtual server. Be very careful when working with this. This will delete the virtual site that is entered into the box. This will change the assigned IP address for a virtual site. This allows you to set resource limits on a virtual host.
Blank entries mean no setting.
CPU Time Allows is the total number of seconds a process can use the CPU before the operating system terminates it. Process Limit limits how many processes each Apache child can have running at once in the virtual host. However, it can prevent CGI's from forking off many subprocesses, and thus will help prevent denial of service from lack of resources. This will allow you to modify the permissions allowed a virtual site, in the same manner that Add Virtual Site sets them up. Simply insert your own values between the double-quotes.