The school system may permit the students to do the above items, subject to the restrictions recited above. The school system may not restrict prayer. The school system may not organize, lead or participate in prayer, for any religion. The school system may not permit its properties to be utilized in furtherance of prayer. This would include public address systems, blackboards, bulletin boards, classroom instructions, teacher requirements or any other thing which encourages, promotes or assists in the furtherance of religion.
Some examples Let's take some examples.
We are at a football game. The game has not yet begun. A group of students, sitting in a student section, decides to recite the Lord's Prayer. That is permissible. One student goes to the microphone to lead the Lord's Prayer.