Scope and Distribute Tags

Hi,

I've been checking about the Scope and Distribute tag inside the Application.xml tag, and still unsure about the advantages that each value bring.

The values are

adaptor

vhost

app

inst

Can somebody explain me briefly the advantages these values can bring? So I can make a choice for my application, also considering server strength.

I am also a bit unsure of the advantages of "numprocs", for example : <Distribute numprocs="11">app</Distribute>

By default, the values in my Application.xml files had

<Scope></Scope>   and

<Distribute numprocs="3">inst</Distribute>

I started using

<Scope>vhost</Scope>

<Distribute numprocs="11">app</Distribute>

because it seemed better, but I'd like some easy clarifications

Thanks!