Configuration differences for jails

[=?gb2312?B?1cUgt+c=?=]

Hi,

I am now trying to use jail in FreeBSD. I have read the jail(8) man page 
and some 
others documents for setting up jails. But I'm a little confused about the 
procedure and configurations for setting up jails. 
As known to all, jail can be used for two purposes, i.e. jailing a single 
application or acting as a virtual host. What i want to know is the 
concrete configuration (procedure) difference between the two types use of 
jails. Is there a SMALLEST set 
of configuration necessary for setting up a jail? If so, what is it? 
Another question,
is there any way to detect the share of files between multiple jails 
automatically?

BTW, what is the meaning of "IMHO"? :) 
It appears very frequently in the mail list. 

Sorry for my bad english.
Any reply is appreciated!


Jas

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