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…The code, as the principal legislative document of the Church, founded on the juridical-legislative heritage of Revelation and Tradition, is to be regarded as an indispensable instrument to ensure order both in individual and social life, and also in the Church's activity itself. Therefore, besides containing the fundamental elements of the hierarchical and organic structure of the Church as willed by her divine Founder, or as based upon apostolic, or in any case most ancient, tradition and besides the fundamental principles which govern the exercise of the threefold office entrusted to the Church itself, the Code must also lay down certain rules and norms of behavior.

…In actual fact the Code of Canon Law is extremely necessary for the Church. Since, indeed, it is organized as a social and visible structure, it must also have norms: in order that the hierarchical and organic structure be visible; in order that the exercise of the functions divinely entrusted to her, especially that of sacred power and the administration of the sacraments, may be adequately organized; in order that the mutual relations of the faithful may be regulated according to justice based upon charity, with the rights of individuals guaranteed and well-defined; in order, finally, that common initiatives, undertaken for a Christian life ever more perfect may be sustained, strengthened and fostered by canonical norms.

…Finally, the canonical laws by their very nature must be observed. The greatest care has therefore been taken to ensure that in the lengthy preparation of the Code the wording of the norms should be accurate, and that they should be based on a solid juridical, canonical and theological foundation.

…I therefore exhort all the faithful to observe the proposed legislation with a sincere spirit and good will in the hope that there may flower again the Church a renewed discipline; and that consequently the salvation of souls may be rendered ever easier under the protection of the Blessed Virgin Mary, Mother of the Church.

Joannes Paulus PP. II

The following Canons from "The CODE of CANON LAW" the principal legislative document of the Church. From The Code of Canon Law are derived certain fundamental criteria which govern the people of God. The canonical laws by their very nature must be observed. The canonical legislation will prove to be an efficacious means in order that the Church may progress in conformity with the spirit of the Second Vatican Council, and may every day be ever more suited to carry out its office of salvation in this world.

The Real Presence - The Following, Canons that Govern:

Can. 941 1 In churches or oratories which are allowed to reserve the blessed Eucharist, there may be exposition, either with the pyx or with the monstrance, in accordance with the norms prescribed in the Liturgical books.

2 Exposition of the blessed Sacrament may not take place while Mass is being celebrated in the same area of the church or oratory.

Can. 942 It is recommended that in these churches or oratories, there is to be each year a solemn exposition of the blessed Sacrament for an appropriate, even if not for a continuous time, so that the local community may more attentively meditate on and adore the eucharistic mystery. This exposition is to take place only if a fitting attendance of the faithful is foreseen, and the prescribed norms are observed.

Can. 943 The minister of exposition of the blessed Sacrament and of the eucharistic blessing is a priest or deacon…

Can. 944 1 Wherever in the judgement of the diocesan Bishop it can be done, a procession through the streets is to be held, especially on the solemnity of the Body and Blood of Christ, as a public witness of veneration of the blessed Eucharist.

2 It is for the diocesan Bishop to establish such regulations about processions as will provide for participation in them and for their being carried out in a dignified manner.