remote | local blocks in protocol settings

Hello,

Where can I find detailed documentation on how "remote" & "local" blocks are used in protocol configuration to provide specific settings for particular IPs/Names?

I've been searching around (wiki2, Google) but I found very few things. I also checked in the conf.d directory of the installation and couldn't find anything.

One useful thread was here:

http://www.dovecot.org/list/dovecot/2010-June/050069.html

where we can read about the "filter" hierarchy:

protocol name {
   remote <ip|name> {
     local <ip|name> {

but I would really appreciate reading more complete documentation (and, hopefully, examples).

Thanks, Nick