A poster in one of our comboxes has asked for a posting on how to serve the Dominican Rite Mass. For Missa Cantata and Solemn Mass, this is a very complex question. I am going to see if it would be possible to do something about making the Bonniwell Ceremonial and Altar Boy's Manual made available on the sidebar. They are both over 50 years old, so probably not under copyright protection.
Since the request came from one who knows the old Roman Rite, I am going to limit myself to what is different. So, to serve the Low Mass observe the following:
1. Genuflect with the priest on arriving at the altar and on departure only, if there is a tabernacle. Do not genuflect again during Mass, except for the Creed and Last Gospel. Domincians do not genuflect, but rather bow, when crossing before the tabernacle during Mass. Properly speaking, you should arrive carrying the Missal to deposit on the stand, and then you should light the candles (Gospel side first), but it is common for the Missal to be there already and the candles to be already lighted.
2. When the priest goes to the altar, get the cruets so that the priest can Make the Chalice. Say "Benedicite" to him before you give him the water. Kiss the priest's hand when you give him something or take it back (e.g. the cruet).
3. If you do not know the Dominican "Prayers at the Foot of the Altar," it is not a problem. The priest can use the formula from Prime when recited alone and say them by himself. You can find the proper responses in the link to the Ordinary for Low Mass link on the sidebar. Note that we do not strike our breasts at our single "mea culpa." Also, do not say "Deo gratias" after the readings: it is not done in the Dominican rite, except after the Last Gospel.
4. At the Offertory, minister the Lavabo and towel. Do not bring the wine as the chalice has already been prepared. When the priest says "Orate fratres" do not make any response. It is not in our rite.
5. When you have recited the Sanctus with the priest, go and light the "Sanctus Candle" as he begins the Canon. If there is no Sanctus Candle, you don't have to do this.
6. In some places, e.g., Australia, it is the custom, when the priest kisses the chalice after the mingling to rise, go to the altar and pick up the Pax Instrument (or lacking that the paten) and offer it to him to kiss. He will then give you the kiss of peace by saying "Pax tibi et sanctae Dei Ecclesiae." But do not do this unless the priest has told you it is the local practice.
7. Do not strike your breast at the Agnus Dei or at the Domine Non Sum Dignus.
8. After the dialogue of the Last Gospel, go immediately to snuff the candles (Epistle side first), while the priest is reading it, unless he tells you not to do this (it is not customary ni some places). When he picks up the chalice, you get the Missal (unless he tells you that it will be left on the altar).
9. In some places the old blessing in the sacristy is used: Mass concludes in the same way as the common Roman usage. In the sacristy: the server kneels and says "Benedictus Deus!", to which the priest responds blessing "Pater, et Filius et Spiritus Sanctus!" If the priest expects you to help him take off his vestments, do that first and then kneel, kiss his scapular, and say, "Benedictus Deus."
Other than that, serving Dominican Low Mass is identical to the old Roman Rite.