From A Popular Guide to the New Mass, written by the Master of Ceremonies at Westminster Cathedral, and published in 1970:

On arriving at the altar the priest kisses it and goes straight to his chair where he does something he has never done before. He greets the people: says ‘hello” in a liturgical way. When you think about it, the priest has never acted like a gentleman at the beginning of Mass because, without a word to the people (many of whom he probably knows well), he turns his back on them and gets on with his own preparation for Mass. . .  Now that has been put right. The priest has become a gentleman, so he faces the people . . . [In the new Entrance Rite] the priest and his people have been ‘introduced’.

(I particularly like ‘many of whom he probably knows well’.)

Quoted in The Banished Heart, a very good read by Geoffrey Hull.