At the PMB website: www.sigb.net
At the users' forum: www.sigb.net/communaute
Via the users' mailing lists : pmb.user@sigb.net (free subscription, just send an email subject SUBSCRIBE to pmb.user_request@sigb.net)
Via the mailing lists for translators, developers, for Unicode support (non European alphabets). For more information on these lists, go to www.sigb.net
This documentation is viewable online at www.sigb.net/doc, the HTML version may be downloaded freely, it can be integrated within PMB to become a contextual help.