From "The Catholic Herald":
Cardinal Kurt Koch, president of the Pontifical Council for Promoting Christian Unity, told a news conference today that sharing the sacrament of Communion continues to be a sign that Christian churches have reconciled fully with one another. Furthermore, the Catholic Church makes a distinction between “Eucharistic hospitality for individual people and Eucharistic communion.”
The term hospitality is used to refer to welcoming guests to the Eucharist on special occasions or under special circumstances as long as they recognise the sacrament as the real presence of Christ.
Eucharist Communion, on the other hand, refers to a more regular situation of the reception of Communion by people recognised as belonging to the same family.
If only Jesus had explained all this when he told his followers, at what we now call "the Last Supper," to eat bread and drink wine to help them remember him. It's a good job that the Roman Catholic part of the Church has such eminent theologians and lawyers who are able to, so confidently, tell us what Jesus really meant.