Configuring instances/app directly in SiteConfig.xml

Hi,
A couple questions regarding wotask:
I think we can get some information about instances with wotask, but I 
couldn't find how to do it, for exemple:
-getting the list of running instances
-getting the list of dead/crashed instances
-getting the memory usage of an instance
-getting the CPU usage of an instance
-getting the port number of an instance
basically to know what is on/off and display these information in a Web 
Application.
I think I've seen something like that with grep, but maybe I'm wrong. 
Anyway I don't know exactly how to get to these informations:(

We've also got some problems when we use Monitor after modifying 
directly the xml file (we stop Monitor before modifying):
The instances and apps show up in Monitor, but if we change anything 
regarding the previous app/instances, it erases everything we added to 
the xml file. And if we try to change something to the instances/apps 
we added directly, Monitor gives an error complaining it doesn't exist 
(because it seems it erases it just after submitting a modification).

Thanks

Xavier