this is an optional part of the Rite of Acceptance into the Order of Catechumens (we just celebrated it this past Sunday). First the priest or deacon engages in a dialogue with the catechumens wherein they indicate their desire to become Christian to know Christ and gain eternal life. He then asks the assembly and the sponsors to pledge support for the catechumens in their journey and gives a blessing.
The sponsors and catechists (and parents if the catechumens include children or youth) are invited to make the sign of the cross on the person’s forehead. the catechist or sponsor may also make the sign on the mouth, ears, eyes, hands and feet. The prayer that accompanies each blessing consecrates each of the senses to learning and incorporating the Word of God into one’s life. After this rite, bibles are presented to the catechumens as they begin their journey of faith toward Chrisitian initiation. In cultures where actually touching the person may not be acceptable (such as some Asian countries) the signing can be done without actually touching the person, The reason the sponsors participate is that they represent the whole Church and the parish community as they hand on the faith to the catechumens.