To update a Sitelutions DNS entry you must specify:

subsys=Sitelutions

In the domain section inside the INI file.  When using Sitelutions as your DNS
subsystem, you must including the following parameters as part of the domain
configuration:

subsys_user=<id>

Your Sitelutions user id (usually an email address)

subsys_pwd=<pwd>

Your Sitelutions password

subsys_id="id[,id,id ...]"

A comma separated list of Sitelutions A record IDs to be updated for this
domain entry.

There is currently one optional parameter available for Sitelutions:

subsys_ttl=<ttl>

The TTL value for your domain record, in seconds.

An example domain section that uses Sitelutions in an INI file might look like
this:

[mydomain.com]                ; Section heading - can be anything you want
dev = local                   ; Use local network address detection
dev_name = eth0               ; Grab IP address from eth0 device
subsys = Sitelutions          ; Use the Sitelutions DDNS service
subsys_user = user@domain.com ; ID
subsys_pwd = password         ; Sitelutions password 
subsys_id = "0000001,0000002" ; List of A record IDs to update