Very interesting! Is this a religious community? Or just a pious association of ministers?
They seem to have a very sacramental approach.
The Society of the Holy Trinity is a ministerium of North American Lutheran clergy (ELCA, LC-MS, WELS, and ELCIC) who seek mutual accountability and support in living out their Ordination vows.
You can read the Rule of the Society at http://www.societyholytrinity.org/rule.htm