In my denomination, practice and theology of Eucharist varies according to community and pastoral leadership. For example, at my church we have two pastors, and the invitation to communion itself is very telling. While the senior pastor believes in an "open table," he invites all who call Christ Lord to partake. The associate pastor (me) invites everyone, and makes no distinctions, so it depends on who is at the table from week to week. I think the underlying discussion of presence is very interesting, as I am currently studying the evolution of Eucharistic form and theology in the church, and the movement away from the open commensality of Jesus toward a combination of memorial and vehicle of grace as sacrament. Fascinating to watch the development from the early church through the patristic era into the medieval, when transubstantiation really took hold, although not necessarily over against consubstantiation or even annhiliation ideas. Even the Council of Trent left the door open on that one.