AR Extension, Bulk Upload and Synchronize

Hi,

I am looking at ActiveRecord Extension

http://www.continuousthinking.com/tags/arext/rdoc/index.html

as a way of helping me synchronize data from a csv file. I have the
app working using row by row query, but the bulk upload looks like it
will help speed things up. There is also mention of a synchronize
method. But I have only found limited documentation.

If anyone has any pointers to some docs, or some information on how
bulk upload and synchronise work I would be grateful. Will synhronize
allow me to send multiple rows in one hit and have the table updated
where there are changes, and can I control the direction of changes,
ie. csv to db.

thanks
Tonypm