BTW, I may have oversimplified that a bit- they are not, strictly speaking, diocesan priests, they are priests of their respective societies, so for example an Institute priest’s district superior would have the say over the what and where of his future rather than the local Bishop. Their lives and priestly ministries, however, closely mirror those of diocesan priests- the main emphasis is on offering the sacraments (especially the Mass and Confession), but also a little smattering of everything-leading pro-life prayer services by the abortion clinic, hosting spiritual retreats and summer camps, organizing pilgrimages, presiding at Church weddings, bringing Communion to the sick, visiting those in prison, and so forth.