[SyncEvolution] Http server questions

I am interested in setting up a family addressbook server and have a few questions about the syncevolution http server as documented by the HTTP server HOWTO <http://syncevolution.org/wiki/http-server-howto> wiki page. For each user (device), do I repeat steps 4 through 7 (from the How-To) - with appropriate changes to parameters/variables? I assume I can manage the entries by adding, deleting, and changing files in the addressbook directory. If so, - What file format(s) are allowed? - Will the directory and/or files be locked during a synch to prevent failures? - Any special instructions (gotchas) regarding maintaining the files in the addressbook? Is this information already available & I just missed it? thanks, steve roush