quota-status service

I'm trying to understand the quota-status service, but I can't find complete documentation.

The quota-status service is mentioned here: http://wiki.dovecot.org/Quota

And an example configuration is shown:

service quota-status {

executable = quota-status -p postfix

inet_listener {

    port = 12340

    # You can choose any port you want

}

client_limit = 1

}

But I can't find any information on quota-status.

"man quota-status" returns nothing.

I am unable to find a "quota-status" file on my machine. Where is the executable located?

What does the "-p postfix" option do?

Are there any other command line options?

The above wiki page shows three quota_status_* options in use:

quota_status_success = DUNNO
quota_status_nouser = DUNNO
quota_status_overquota = "552 5.2.2 Mailbox is full"

Where are their meanings documented?

What are the allowed values?

Are there other quota_status_* options?

Thanks in advance.

Thanks,

Michael