Best Place for information is the Vatican website. Two documents I found there I found to be very helpful concerning Holy Communion, one is,
Ecclesia de Eucharistia an encyclical letter by his Holyness John Paul II and the other instructions for Norms concerning Mass & Holy Communion,* Redemptionis Sacramentum* published by Congregation for Divine Worship and the Discipline of the Sacraments & the Congregation for the Doctrine of the Faith both working together.
Code:
I copied parts from Redemptionis Sacramentum that I find relivant to this thread.
ENCYCLICAL LETTER ECCLESIA DE EUCHARISTIA OF HIS HOLINESS POPE JOHN PAUL IITO THE BISHOPS PRIESTS AND DEACONS MEN AND WOMEN IN THE CONSECRATED LIFEAND ALL THE LAY FAITHFUL ON THE EUCHARIST IN ITS RELATIONSHIP TO THE CHURCH
Ecclesia de Eucharistia, In this beautiful document Pope John Paul II states, inter alia, that the Holy Eucharist “stands at the center of the Church’s life” (no. 3), that “it unites heaven and earth. It embraces and permeates all creation” (no. 8), and that it “is the most precious possession which the Church can have in her journey through history” (no. 9).
***Redemptionis Sacramentum ***
This is the origin of this Instruction which the Congregation for Divine Worship and the Discipline of the Sacraments in close collaboration with the Congregation for the Doctrine of the Faith, now offers to the Latin Church.
- THE DISTRIBUTION OF HOLY COMMUNION
- Although each of the faithful always has the right to receive Holy Communion on the
tongue, at his choice,178 if any communicant should wish to receive the Sacrament in the
hand, in areas where the Bishops’ Conference with the recognitio of the Apostolic See has
given permission, the sacred host is to be administered to him or her. However, special care
should be taken to ensure that the host is consumed by the communicant in the presence of
the minister, so that no one goes away carrying the Eucharistic species in his hand. If there
is a risk of profanation, then Holy Communion should not be given in the hand to the
faithful.179
The Extraordinary Minister of Holy Communion
[154.] As has already been recalled, “the only minister who can confect the Sacrament of the Eucharist in persona Christi is a validly ordained Priest”.[254] Hence the name “minister of the Eucharist” belongs properly to the Priest alone. Moreover, also by reason of their sacred Ordination, the ordinary ministers of Holy Communion are the Bishop, the Priest and the Deacon,[255] to whom it belongs therefore to administer Holy Communion to the lay members of Christ’s faithful during the celebration of Mass. In this way their ministerial office in the Church is fully and accurately brought to light, and the sign value of the Sacrament is made complete.
[155.] In addition to the ordinary ministers there is the formally instituted acolyte, who by virtue of his institution is an extraordinary minister of Holy Communion even outside the celebration of Mass. If, moreover, reasons of real necessity prompt it, another lay member of Christ’s faithful may also be delegated by the diocesan Bishop, in accordance with the norm of law,[256] for one occasion or for a specified time, and an appropriate formula of blessing may be used for the occasion. This act of appointment, however, does not necessarily take a liturgical form, nor, if it does take a liturgical form, should it resemble sacred Ordination in any way. Finally, in special cases of an unforeseen nature, permission can be given for a single occasion by the Priest who presides at the celebration of the Eucharist.[257]
[156.] This function is to be understood strictly according to the name by which it is known, that is to say, that of extraordinary minister of Holy Communion, and not “special minister of Holy Communion” nor “extraordinary minister of the Eucharist” nor “special minister of the Eucharist”, by which names the meaning of this function is unnecessarily and improperly broadened.
[157.] If there is usually present a sufficient number of sacred ministers for the distribution of Holy Communion, extraordinary ministers of Holy Communion may not be appointed. Indeed, in such circumstances, those who may have already been appointed to this ministry should not exercise it. The practice of those Priests is reprobated who, even though present at the celebration, abstain from distributing Communion and hand this function over to laypersons.[258]
[158.] Indeed, the extraordinary minister of Holy Communion may administer Communion only when the Priest and Deacon are lacking, when the Priest is prevented by weakness or advanced age or some other genuine reason, or when the number of faithful coming to Communion is so great that the very celebration of Mass would be unduly prolonged.[259] This, however, is to be understood in such a way that a brief prolongation, considering the circumstances and culture of the place, is not at all a sufficient reason.
[159.] It is never allowed for the extraordinary minister of Holy Communion to delegate anyone else to administer the Eucharist, as for example a parent or spouse or child of the sick person who is the communicant.
[160.] Let the diocesan Bishop give renewed consideration to the practice in recent years regarding this matter, and if circumstances call for it, let him correct it or define it more precisely. Where such extraordinary ministers are appointed in a widespread manner out of true necessity, the diocesan Bishop should issue special norms by which he determines the manner in which this function is to be carried out in accordance with the law, bearing in mind the tradition of the Church.